Indian Journal of Psychological Medicine
  Home | About Us | Editorial Board | Search | Ahead of print | Current Issue | Archives | Instructions | Contact | Advertise | Submission | Login 
Users Online: 1154 
Wide layoutNarrow layoutFull screen layoutHome Print this page Email this page Small font sizeDefault font sizeIncrease font size

 Table of Contents    
Year : 2015  |  Volume : 37  |  Issue : 3  |  Page : 299-304  

Psychological barriers to tobacco cessation in Indian buprenorphine-naloxone maintained patients: A pilot study

Department of Psychiatry and National, Drug Dependence Treatment Center, All India Institute of Medical Sciences, New Delhi, India

Date of Web Publication17-Aug-2015

Correspondence Address:
Raka Jain
Department of Psychiatry and National, Drug Dependence Treatment Center, All India Institute of Medical Sciences, New Delhi - 110 608
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0253-7176.162944

Rights and Permissions

Context: The prevalence of smoking in opioid agonist treatment programmes remains high, leading to significant tobacco related health hazards and mortality. This is the first study from India addressing tobacco cessation and related barriers among recipients of buprenorphine-naloxone maintenance treatment. Aims: The purpose of the study was to investigate Indian buprenorphine-naloxone maintained patients' willingness to quit tobacco use, to determine its possible association with demographic, agonist maintenance treatment, tobacco use related variables and personal health and risk perceptions related to health hazards associated with tobacco use. Settings and Design: The study was cross-sectional, observational. It was conducted in the out-patient department of a national level de-addiction centre in India. Materials and Methods: Fifty-five males on buprenorphine-naloxone treatment were assessed using Tobacco Use Characteristics, Fagerstrom Test for Nicotine Dependence (FTND and FTND-ST), Readiness to Change questionnaire (RCQ), Smoker's Perceived Health Risk Evaluation (SPHERE), Importance of Intervention scale and a semi-structured questionnaire. Statistical Analysis: Descriptive statistics, Kruskal-Wallis Chi-square test, Spearman rank order correlation, paired-t test, ANOVA (STATA 9.2 statistical package). Results: Around 65.4% of the subjects were smokers, 9% were using smokeless tobacco only whereas 25.6% were using both. Mean duration of tobacco use was 20 ± 1.5 years. Only 20% had past quit attempts. Only 24% were in action phase of change. Personal health and risk perceptions were poor and only 61.62% considered intervention tobacco smoking cessation important. Conclusions: Higher severity of nicotine dependence, low perception of harm from tobacco warrant immediate attention and need for on-site treatment opportunity.

Keywords: Buprenorphine-naloxone maintenance treatment, health and risk perception, tobacco cessation

How to cite this article:
Mandal P, Jain R, Jhanjee S, Sreenivas V. Psychological barriers to tobacco cessation in Indian buprenorphine-naloxone maintained patients: A pilot study. Indian J Psychol Med 2015;37:299-304

How to cite this URL:
Mandal P, Jain R, Jhanjee S, Sreenivas V. Psychological barriers to tobacco cessation in Indian buprenorphine-naloxone maintained patients: A pilot study. Indian J Psychol Med [serial online] 2015 [cited 2019 Oct 19];37:299-304. Available from:

   Introduction Top

Growing public awareness of the public health issues of tobacco consumption particularly in the form of smoking has led to the development WHO-Framework of Convention on Tobacco Control (WHO-FCTC) and various prevention, awareness building and treatment programs are being implemented worldwide. These measures are expected to bring down tobacco use among general population. However, smoking rates for patients with a substance use disorder remain high and stable. [1] Studies suggest that smoking rates are almost three times higher in opiate dependent persons in methadone maintenance treatment (MMT) programmes as compared to the general population. [2],[3] The rate is even higher (85-98%) among patients on agonist maintenance treatment. [1],[2],[4],[5] Importantly, smokers usually underestimate their personal susceptibility of tobacco related health hazards [6],[7] leading to continued use of tobacco causing high morbidity and mortality in the drug using population including those in treatment. The mortality rate is twice the rate expected in general population. [8] Therefore, it is imperative to study tobacco use in this population so that treatment needs can be addressed adequately.

Unfortunately, little attention is being paid to the issue of tobacco use among opioid users till date. In US national evaluations of methadone maintenance treatment programmes, little to no mention is made of monitoring or treating cigarette use among patients. [9] Olsen et al., in a relatively recent study reported that, nicotine dependence rarely receives attention in methadone programmes. [10] Despite preliminary evidence that smoking cessation counselling can be provided without necessarily leading to a relapse with other substances, [11] such beliefs continue to persist and represent an important treatment barrier. [12],[13] The current study is the first study from India which aims to address the pattern of tobacco use among opioid dependent patients on buprenorphine-naloxone maintenance treatment, their willingness to quit tobacco and to determine its possible association with various demographic, agonist maintenance treatment and tobacco use related variables. Relation between willingness to quit tobacco and perceived personal health and risk perceptions related to health hazards associated with tobacco use has been specifically emphasized.

   Material and Methods Top

Study design and universe

This study has a cross-sectional design and was conducted at the out-patient department of a national level drug dependence treatment centre. The centre offers free-of-cost agonist as well as antagonist maintenance therapy to opioid dependent patients. [14]


Fifty-five male opioid dependent subjects aged between 18-60 years maintained on bi-weekly dispensing regimen of buprenorphine-naloxone maintenance treatment for more than 12 weeks, who were current tobacco users (subjects using tobacco in any form over last one month and testing positive for urinary cotinine ) formed the sample of the study. Buprenorphine compliance was confirmed by self-report, urine screening and patient's treatment records. Patients with a monthly attendance of more >80% were considered compliant.

Subjects having current or past psychiatric co-morbidities or dependence on drugs other than opioid and nicotine (assessed by clinical history and urine screening for other drugs of abuse by thin later chromatography), history of in-patient treatment in last 8 weeks (confirmed from medical records) or currently on any tobacco cessation therapy were excluded.

Data collection

Data collection for each participant was completed in single session. The subjects were assessed for:

  1. Socio-demographics,
  2. Pattern of tobacco use,
  3. Willingness to quit tobacco and
  4. Perceived personal health and personal risks associated with tobacco use.


  1. Tobacco Use Characteristics [4] : This consists of seven questions on tobacco use which were adapted from the Behavioral Risk Factor Surveillance System, [15] The Youth Risk Behavior Survey, [16] and the Mayo Nicotine Dependence Centre Questionnaire by Richter and colleagues. These tobacco questions have high validity. [4]
  2. Fagerstrom Test for Nicotine Dependence (FTND) [17] : It is a standard instrument to measure the severity of nicotine dependence. FTND has reliable psychometric property [17] and is widely used.
  3. FagerstromTest for Nicotine Dependence for smokeless tobacco user, FTND-ST)] [18]: This validated questionnaire measures severity of nicotine dependence in smokeless tobacco users. The coefficient alpha is comparable to other nicotine dependence measures.
  4. Readiness to change questionnaire, RCQ [19] : This scale assesses the stages of change as in the trans-theoretical model. [20] Individuals not willing to quit in next 6 months were allocated to pre-contemplation stage and those considering so were included in contemplation stage and individuals who already started reducing tobacco use were allocated in action stage.
  5. Smokers' Perceived Health Risk Evaluation, SPHERE [21] : SPHERE has two subscales with 3 items each. In the subscale named 'Smoking Related Health' (SRH), the smokers are asked to rate their health relative to the health of an average smoker, ex-smoker their age, and non-smoker of their age, on a scale from 1 (much worse) to 5 (much better). The other subscale, 'Smoking Related Risk' (SRR) assess perceived likelihood of developing smoking-related illnesses like cancer, coronary heart disease and chronic lung disease with continued smoking, on a scale anchored at 0 (no chance) to 100 (certain). It has reliable psychometric properties and has been used and validated in smokers in methadone maintenance programme. [21]
  6. Perceived importance of intervention [21] : This Likert scale assesses perceived importance of intervention. Responses range from 'not important' (1) to 'extremely important' (6).
  7. Semi-structured questionnaire: The socio-demographic, substance use, medical and psychiatric diagnoses, dependence on substances other than opioid and nicotine and tobacco use pattern at the initiation of maintenance treatment, buprenorphine/buprenorphine-naloxone maintenance treatment details were noted in the proforma after being additionally confirmed from medical records. Multiple choice questions were asked regarding past quit attempts, reasons for relapse and choice of intervention. Smokeless tobacco users were asked to name the possible health risks associated with tobacco use.

There was no loss of data and all the observations were available for analysis. All instruments used in the study were translated into local language and back translated. Ethical clearance was obtained from institution ethics committee.

Data analysis

Data was analysed using STATA 9.2 Statistical package. Descriptive statistics were used to analyse the profile of the participant. To explore association between various socio-demographic and maintenance treatment related variables with tobacco use related variables, non-parametric test (Kruskal-Wallis Chi-square) and Spearman's rank correlation were chosen. Paired t-test was used to compare quantity of past and current tobacco use. Intergroup comparisons were done using analysis of variance (ANOVA) with Tukey's post-hoc test.

   Results Top

Sample characteristics

All patients were males and the mean age of the sample was 37.8 (Standard Deviation, SD ± 7.2) years and belonged to nuclear family. The majorities were past heroin users (96.36%). Most subjects had also used alcohol (83.64%) and cannabinoids (70.91%) in the past. All the subjects were on bi-weekly dispensing regime of buprenorphine naloxone and mean dose was 9.67 ± 2.06 (SD) mg per day. Mean duration of maintenance was 73.11 (53.13 ± SD) weeks (median 56.3 weeks).

Tobacco use pattern

Mean age of starting any kind of tobacco product was 15.6 ± 4.7years. Mean duration of nicotine dependence is 20 ± 1.5 years. The mean FTND score for smokers was 5 ± 1.7 (N = 50), indicative of medium dependence and mean FTND-ST score for smokeless tobacco users was5.6 ± 3.2 (N = 19). Lower age of initiation of any kind of tobacco use was found to be significantly associated with higher nicotine dependence (Pearson product-moment correlation, P < 0.05). Fifty-eight percent of the study population reported decrease in tobacco consumption after entering into buprenorphine maintenance treatment. A significant decrease was found in the number of both cigarette (P = 0.003) and bidi (P < 0.001, paired t-test) by paired t-test. Actual decrease cannot be quantified in three subjects as they started smokeless tobacco use after stoppage of smoking or reduction in smoking.

Detail of sample characteristics and tobacco use is given in [Table 1].
Table 1: Profile of patients

Click here to view

Past quit attempts and current willingness to quit

Past quit attempts were attributed mostly to external factors like, family pressure or physician's advice. Mean duration of abstinence was 4 ± 1.3 weeks. Withdrawal symptoms and peer pressure were the most common reason for relapse among subjects with past quit attempts. None of the quit attempts were self-motivated. Medical assistance was never sought.

Socio-demographic, maintenance treatment variables and (P > 0.05) tobacco use related variables (P > 0.05) did not differ among the pre-contemplators (P > 0.05), contemplators (P > 0.05) and subjects in action stage (P > 0.05, ANOVA, with Tukey's post-hoc analysis).

[Table 2] depicts detail of current tobacco use pattern, past quit attempts and current willingness to quit.
Table 2: Pattern of tobacco use, past quit attempts and current willingness to quit

Click here to view

Perceived personal health and perceived personal susceptibility to health- risks and willingness to quit

Sixty-one percent of the smokers reported their health 'as good as average smoker their age' while 63.9% reported their health is 'as good as ex-smokers' [Figure 1]. No intergroup difference in perceived smoking related personal health was found among pre-contemplators, contemplators and subjects in action stage of change (ANOVA, P > 0.05). Perceived personal susceptibility (smoking related risk) to developing smoking related health hazards like cancer, coronary heart disease, and chronic lung disease with continued smoking was also poor among the participants [Figure 2]. Total duration of tobacco use and severity of dependence were not associated with smoking related health perception scores (P > 0.05) and smoking related personal risk perception score for any of the disease conditions (Kruskal-Wallis chi square test) like cancer (P > 0.05) and coronary artery disease (P > 0.05) or chronic lung disease (P > 0.05).
Figure 1: Response pattern to Smoking Related Health (SRH) questionnaire

Click here to view
Figure 2: Response pattern to Smoking Related Risk (SRR) questionnaire

Click here to view

Perceived importance of intervention and choice of intervention

Response pattern for perceived importance of intervention and choice of intervention is given in [Table 3]. Although no difference was found (ANOVA, with Tukey's post-hoc analysis) in perceived importance of intervention among subjects with different levels of education, an increasing trend of importance of intervention was noticed with increasing levels of education which was statistically non-significant. No significant intergroup difference in perceived importance of intervention found among smoker, smokeless tobacco user or subjects using both (ANOVA, with Tukey's post-hoc analysis). A positive correlation was observed between the perceived importance of intervention with perceived personal risk of developing chronic lung disease (Spearman rank order correlation, P < 0.05).
Table 3: Perceived importance of intervention for tobacco cessation and choice of intervention

Click here to view

   Discussion Top

In the current study population, tobacco use pattern differed markedly from patterns found in the general Indian population. In India, smokeless tobacco use predominates but in this study, the percentage of smokers was higher. [22] However, among the various forms of tobacco, bidi continues to be the commonest form of smoking and Khaini and gutkha were used by the smokeless tobacco users, matching the national pattern. The commonest age of tobacco initiation again matches with national data. [22],[23]

Similar studies in methadone maintenance programs have a higher prevalence of smokers, who smoked more, and were more interested in quitting [3],[24],[25],[26] as found in this population. Less number of past quit attempts and absence of long term abstinence among these subjects, in spite of long duration of tobacco use, are also very much similar with findings from past studies [4],[7],[27],[28],[29] in methadone clinics. Possible reason for low quit rates may be due to the fact that none of our patients were ever previously treated with prescription medication for smoking cessation. However, difficulty in quitting may also be due to greater nicotine dependence, and interactions of nicotine and opioids via dopamine in brain reward pathways that influence motivation to quit. Although experimental studies suggest that single doses of opioid agents like methadone and buprenorphine may increase cigarette smoking in opioid-dependent individuals for short duration [30],[31] the effects of long-term methadone maintenance treatment on smoking behaviour are less clear. There is some support for an association between cigarette smoking and methadone dose in that methadone patients who exhibited higher smoking rates are significantly more likely to report problems of not feeling 'held' by their methadone dose and to experience a higher level of anxiety. [32] More adequate methadone dosing would probably reduce such effects. However, initiation of methadone maintenance treatment has been associated with self-reported positive changes in smoking behaviour. [33] A similar positive change in terms of reduction in tobacco consumption is also found in the current study population. However, it would be wise not to attribute this reported decrease to buprenorphine treatment alone. In fact, with currently available data on buprenorphine -nicotine interaction, no causality of any kind can be established. Psychological factors and lifestyle changes associated with buprenorphine maintenance also could explain the current findings.

Despite the well-established health risks of smoking, [34] evidence indicates that smokers endorse a set of risk-minimizing beliefs regarding their own perceived risk thereby viewing themselves as exempt from the well-documented health risks of smoking. [35] However, researchers have reported conflicting results regarding the direction and magnitude of smokers' biases in evaluating smoking-related health risks, as well as the tendency for smokers to underestimate their own personal risk for developing smoking-related health problems. In the current study, validated instrument (SPHERE) has been used to measure smoking related health and risk perception. The original study [21] which validated and used this instrument (SPHERE) on smokers in MMT, used the word 'smoker' but in the current study it is modified as 'who is also opioid dependent and currently on BPN' for further clarity. This is contrary to the results in studies on methadone maintained subjects where the subjects reported high ratings of personalized risk perception. [2],[36]

Tendency to perceive better personal health and minimize personal risk perception of developing diseases associated with continued tobacco use might be due to the fact that majority of the individuals believe that they have reduced their tobacco use and consider current pattern safer and also believe that whatever damage had been done cannot be reversed and their health can be no worse than ex-smoker.

Amongst all the given choices, majority of the study population opted for 'advice and guidance' only as the choice of intervention and did not demand any pharmacological intervention for tobacco cessation. This is contrary to the findings from methadone clinics where the smokers were willing to enrol in on-site smoking cessation treatment. [24],[25],[26] This may be possibly due to the fact they already have reduced their tobacco use after entering into the maintenance treatment and therefore did not feel the need for any intervention. Lack of awareness or knowledge about the existing pharmacotherapy for tobacco cessation may be another reason. However, undermining the seriousness of the health hazards associated with continued use of tobacco still remains a possibility. Significant positive correlation of importance of intervention with risk of developing chronic lung disease may be due to higher awareness regarding this hazard.

This study has several limitations. It has relatively small sample size compared to previous similar studies. The subjects represent a special population who had never sought treatment for tobacco cessation. The findings could differ in treatment seeking population. Longitudinal studies including behavioural and biochemical verification of smoking could provide better insight to the ongoing factors acting as barriers to tobacco cessation. However, this study provides important baseline information for planning an acceptable on-site treatment facility for tobacco cessation for opioid dependent individuals.

   Acknowledgments Top

The authors are thankful to Professor. Rajat Ray, EX-Chief of National Drug Dependence and Treatment Centre (NDDTC), All India Institute of Medical Sciences, New Delhi, India, and Prof. S K Khandelwal, Chief NDDTC and HOD, department of Psychiatry for their continuous support and encouragement. We thank Dr. Atul Ambekar, Additional Professor, NDDTC for his valuable suggestions. Dr. Piyali Mandal received'ICMR financial assistance to MD/MS/DM/MCH thesis programme' of Indian Council of Medical Research, for this study and this is highly acknowledged.

   References Top

Stark MJ, Campbell BK. Cigarette smoking and methadone dose levels. Am J Drug Alc Abuse 993;19:209-17.  Back to cited text no. 1
Best D, Lehmann P, Gossop M, Harris J, Noble A, Strang J. Eating too little, smoking and drinking too much: Wider lifestyle problems among methadone maintenance patients. Addict Res 1998;6:489-98.  Back to cited text no. 2
Clarke J, Stein MD, McGarry KA, Gogineni A. Interest in smoking cessation among injection drug users. Am J Addict 2001;10:159-66.  Back to cited text no. 3
Richter KP, Gibson CA, Ahluwalia JS, Schmelzle KH. Tobacco use and quit attempts among methadone maintenance clients. Am J Public Health 2001;91:296-9.  Back to cited text no. 4
Nahvi S, Richter K, Li X, Modali L, Arnsten J. Cigarette smoking and interest in quitting in methadone maintenance patients. Addict Behav 2006;31:2127-34.  Back to cited text no. 5
Gibbons FX, McGovern PG, Lando HA. Relapse and risk perception among members of a smoking cessation clinic. Health Psychol 1991;10:42-5. Available from: [Last accessed on 1 Nov 2014].  Back to cited text no. 6
Chapman S, Wong WL, Smith W. Self-exempting beliefs about smoking and health: Differences between smokers and ex-smokers. Am J Public Health 1993;83:215-9. Available from [Last accessed on 1 Nov 2014].  Back to cited text no. 7
Richter K, Arnsten J. A rationale and model for addressing tobacco dependence in substance abuse treatment. Subst Abuse Treat Prev Policy 2006;1:23.  Back to cited text no. 8
Richter KP, Choi WS, McCool RM, Harris KJ, Ahluwalia JS. Smoking cessation services in U.S. methadone maintenance facilities. Psychiatr Serv 2004;55:1258-64.  Back to cited text no. 9
Olsen Y, Alford DP, Horton NJ, Saitz R. Addressing smoking cessation in methadone programs. J Addict Dis 2005;24:33-48.  Back to cited text no. 10
Lang B. Treating tobacco dependence in patients with psychiatric comorbidities. Psychiatr Times 2006;18:9.  Back to cited text no. 11
Joseph A, Lexau B, Willenbring M, Nugent S, Nelson D. Factors associated with readiness to stop smoking among patients in treatment for alcohol use disorder. Am J Addict 2004;13:405-17.  Back to cited text no. 12
Richter KP. Good and bad times for treating cigarette smoking in drug treatment. J Psychoactive Drugs 2006;38:311-5.  Back to cited text no. 13
Ray R, Dhawan A, Chopra A. Addiction research centres and the nurturing of creativity: National drug dependence treatment centre, India-a profile. Addiction 2013;108:1705-10.  Back to cited text no. 14
Remington PL, Smith MY, Williamson DF, Anda RF, Gentry EM, Hegelian GC. Design, characteristics, and usefulness of state-based behavioral risk factor surveillance. Public Health Rep 1998;103:366-75.  Back to cited text no. 15
Kolbe L, Kann L, Collins JL. Overview of the Youth Risk Behavior Surveillance System. Public Health Rep 1993;108:2-10.  Back to cited text no. 16
Heatherton TF, Kozlowski LT, Frecker RC, Fagerstrom KO. The Fagerstrom Test for Nicotine Dependence: A revision of the Fagerstrom Tolerance Questionnaire. Br J Addict 1991;86:1119-27.  Back to cited text no. 17
Ebbert JO, Patten CA, Schroeder DR. The Fagerström Test for Nicotine Dependence-Smokeless Tobacco (FTND-ST). Addict Behav 2006;31:1716-21.  Back to cited text no. 18
Heather N, Luce A, Peck D, Dunbar B, James I. Development of a treatment version of the readiness to change questionnaire. Addict Res 1991;7:63-83.  Back to cited text no. 19
Prochaska JO, DiClemente CC. Stages and processes of self-change of smoking: Toward an integrative model of change. J Cons Clin Psychol 1983;51:390-5.  Back to cited text no. 20
Hayaki J, Anderson BJ, Stein MD. Perceptions of health risk susceptibility in methadone maintained smokers. J Addict Dis 2005;24:73-84.  Back to cited text no. 21
International Institute for Population Sciences. Global Adult Tobacco Survey India (GATS India), 2009-10, India 2010; Ministry of Health and Family Welfare, Government of India.  Back to cited text no. 22
Singh P, Juneja T. Patterns of tobacco use in rural and urban populations of Jhunjhunu district, Rajasthan. Ind J Med Specialities 2010;1:71-4. Available from: [Last accessed on 3 Nov 2014].  Back to cited text no. 23
Shoptaw S, Rotheram-Fuller E, Yang X, Frosch D, Nahom D, Jarvik ME, et al. Smoking cessation in methadone maintenance. Addiction 2002;97:1317-28.  Back to cited text no. 24
Shadel WG, Stein MD, Anderson BJ, Herman DS, Bishop S, Lassor JA. Correlates of motivation to quit smoking in methadone-maintained smokers enrolled in a smoking cessation trial. Addict Behav 2005;30:295-300.  Back to cited text no. 25
Reid MS, Fallon B, Sonne S, Nunes EV, Lima J, Jiang H, et al. Implementation of a smoking cessation treatment study at substance abuse rehabilitation programs: Smoking behavior and treatment feasibility across varied community-based outpatient programs. J Addict Med 2007;1:154-60.  Back to cited text no. 26
Clemmey P, Brooner R, Chutuape MA, Kidorf M, Stitzer M. Smoking habits and attitudes in a methadone maintenance treatment population. Drug Alc Depend 1997;44:123-32.  Back to cited text no. 27
Weinstein ND. What does it mean to understand a risk? Evaluating risk comprehension. J Natl Cancer Inst Monographs 1999;25:15-20.  Back to cited text no. 28
Wapf V, Scfaub M, Klaeusler B, Boesch L, Stohler R, Eich D. The barriers to smoking cessation in Swiss methadone and buprenorphine-maintained patients. Harm Reduct J 2008;5:10.  Back to cited text no. 29
Schmitz JM, Grabowski J, Rhoades H. The effects of high and low doses of methadone on cigarette smoking. Drug Alc Depend 1994;34:237-42.  Back to cited text no. 30
Mutschler N, Stephen B, Teoh S, Mendelson J, Mello NK. An inpatient study of the effects of buprenorphine on cigarette smoking in men concurrently dependent on cocaine and opioids. Nicotine Tob Res 2002;4:223-8.  Back to cited text no. 31
Tacke U, Wolff K, Finch E, Strang J. The effect of tobacco smoking on subjective symptoms of inadequacy ("not holding") of methadone dose among opiate addicts in methadone maintenance treatment. Addict Biol 2001;6:137-45.  Back to cited text no. 32
Baran-Furga H, Chmielewska K, Bonikowska BA, Habrat B, Kostowski W, Bienkowski P. Self-reported effects of methadone on cigarette smoking in methadone-maintained subjects. Subst Use Misuse 2005;40:1103-11.  Back to cited text no. 33
CDC. Reducing the health consequences of smoking: 25 years of progress - A report of the Surgeon General (DHHS publication no. 89-8411) 1989; US Department of Health and Human Services, Public Health Service.  Back to cited text no. 34
Hahn A, Renner B, Schwarzer R. Perception of health risk: How smoker status affects defensive optimism. Anxiety Stress Coping 1998;11:93-112.  Back to cited text no. 35
McCoy SB, Gibbons FX, Reis TJ, Gerrard M, Luus CA, Sufka AV. Perceptions of smoking risk as a function of smoking status. J Behav Med 1992;15:469-88.  Back to cited text no. 36


  [Figure 1], [Figure 2]

  [Table 1], [Table 2], [Table 3]


    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

  In this article
   Material and Methods
    Article Figures
    Article Tables

 Article Access Statistics
    PDF Downloaded77    
    Comments [Add]    

Recommend this journal