Descriptive and statistical results for drug consumption habits are also given in Table 1. The majority of participants (94.4%) reported the consumption of alcoholic beverages; 33.1% of participants reported risky drinking at least at one time-point. Risky drinking was defined as a weekly alcohol consumption equal or greater 168 g of pure ethanol for men and 84 g for women, or less than two days of abstinence/week according to guidelines by the German Federal Center for Health Education [21]. The consumption of caffeinated beverages was reported by 111 (78.2%) participants. Smoking was reported by 38 participants (26.8%), but only 13 participants (9.1%) smoked regularly (.=3.5 days/ week). At mean, regular smokers smoked 64.8652.6 and occasional smokers 4.9866.17 cigarettes/week.