Journal
SUBSTANCE USE & MISUSE
Volume 45, Issue 1-2, Pages 15-30Publisher
TAYLOR & FRANCIS INC
DOI: 10.3109/10826080903498952
Keywords
cigarette; smoking; alcohol; chronotype; sleep-wake cycle; mood
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Funding
- Gottlieb Daimler- und Karl Benz-Stiftung
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Individuals are different 'chronotypes' with early 'larks' and late 'owls' forming the limits of a normal distribution in the population. We recently described that late chronotypes who suffer from a conflict between internal and external time ('social jetlag') suffer from more mental distress and are more likely to smoke than early chronotypes (Wittmann, Dinich, Merrow, and Roenneberg, 2006. Social jetlag: mis-alignment of biological and social time. Chronobiology International, 23:497-509.). We performed a detailed analysis of the same database collected in 2002 comprising 134 daily smokers and 366 nonsmokers, scrutinizing the relationships between chronotype, smoking, and alcohol consumption as well as psychological well-being using a multiple mediation analysis. On average, smokers tend to be later chronotypes, report more sleep-associated psychosomatic symptoms, are more depressed, less balanced, and less vigilant. The mediation analysis suggests that only those late chronotypes who smoke and those who drink more suffer from increased psychological distress. We suggest that 'chronotype' is introduced as an additional factor in substance use, that is, when considering motives for smoking and drinking.
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