“…For example, living away from the parental home has been found to be associated with an increase in alcohol use, heavy episodic drinking, and marijuana use during the early 20s (Bachman et al, 1997a;White et al, 2005White et al, , 2006. Marriage, pregnancy, and parenthood have been associated with reduced alcohol and marijuana use and, to a lesser degree, cigarette smoking during young adulthood (Bachman et al, 1997a;Bailey et al, 2008;Curran et al, 1998;Merline et al, 2008;Yamaguchi and Kandel, 1985). However, transitions into different adult roles are not independent of each other but are clearly interrelated social pathways that include linked developmental trajectories, where each transition cascades into another (Elder, 1998;Masten et al, 2005).…”