the rates for daily use of all substances seem to be lower in Switzerland than in the United States. In spite of these differences in the level of substance use, the growth trajectories for smoking, drinking, and drunkenness in both countries are best described by a quadratic model (Chen & Jacobson, 2012). However, while the 1-month prevalence of drinking in the United States decreases in the late 20s, it stagnates at a high level in our study.
