Long-term behavior in treated alcoholism: Evidence for beneficial carry-over effects of abstinence from smoking on alcohol use and vice versa.

Co-dependence of alcohol and nicotine is quite frequent. Research results on the mutual influence one drug has on the other - i.e., on the further course of the dependence - has been inconclusive. Our primary aim is to investigate the natural course of smoking behavior in a long term follow-up study with alcohol-dependent patients who completed an inpatient treatment program. A sample of 139 out of originally 190 patients was successfully followed up 7 years after index alcohol treatment. After 7 years, 56% of patients (total surviving sample: 46%, 21 [11.1%] patients deceased during the follow-up time interval) were abstinent. Our results show that being a non-smoker at treatment entry is a predictor for alcohol abstinence 7 years later. The rate of non-smokers among the abstinent patients increased by 32%. Potential explanations for our findings lie in carry-over effects. Skills and insights gained in treatment of alcohol dependence could be instrumental in coping with smoking behavior as well. Non-smokers may have more functional coping abilities from the beginning. We conclude that it is warranted and recommendable to explore the willingness of alcohol-dependent patients to quit smoking and to offer them treatment options addressing this point.