Do quitters have anything to lose? Changes in body mass index for daily, never, and former smokers over an 11-year period (1990—2001)

AIMS: The purpose of the present study was to examine whether body mass index (BMI) trajectories differed between daily smokers, never smokers, and former daily smokers among a population-based sample over an 11-year period. METHODS: A cohort of 1,166 adults (n = 579 men; n = 587 women) self-reported BMI during a general health interview twice administered in two regions in Norway. Of the participants, 37.5% were never smokers, 31.6% current smokers, and 31% were former smokers. RESULTS: Those who had quit smoking within the past five years had the highest age-adjusted BMI increase, gaining 3 kg and 5 kg more weight on average than current smokers (women and men, respectively). No significant differences in weight gain over the 11-year period existed between never smokers and former smokers who had quit > or = five years ago. CONCLUSIONS: Our finding that former daily smokers (> or = five years since quitting) demonstrated equivalent BMI increases to never smokers (1990-2001) is in line with evidence suggesting that the average body weight of quitters tends to stabilize over time to levels of never smokers. As post-cessation weight gain often represents a barrier to successful quitting, improved knowledge about the temporal and variable effects of smoking cessation on long-term weight outcome may strengthen motivational enhancement and relapse prevention efforts.