Rückgang des Zigarettenkonsums: Unterschied zwischen den Versionen

*[http://www.sciencedirect.com/science/article/pii/S2211335515000388 2015 The remarkable decrease in cigarette smoking ... 55-88% between 1996 and 2014 among us high school students]

:This analysis complemented earlier work that has documented decreasing intensity of cigarette use among young people, for example the finding by Jones et al. (2011) that among current cigarette smokers, the frequency of light smoking (< 1–5 cigarettes per day) had increased significantly from 1991–2009, while for heavy smoking (> 11 cigarettes per day) the frequency had more than halved.