Trajectories of marijuana use and the transition to adulthood.

Alongside the rise of emerging adulthood, policy contexts for marijuana have rapidly changed, with increases in availability and the number of daily users. We identify heterogeneous pathways of marijuana use from age 16 to 26, and examine how these pathways differentiate adult role transitions by age 28. Latent class analyses identified five trajectories: abstainers, dabblers, consistent users, early heavy quitters, and persistent heavy users. Dabblers are no different from abstainers on educational and labor market outcomes, and both have higher odds of adult role transitions relative to heavier use classes. Dabblers differ from abstainers on certain family transitions, yet remain distinct from the heavier use classes. Besides parenthood, early heavy quitters and persistent heavy users are similar, suggesting that heavy use is particularly detrimental early during transitions to adulthood. Distinct trajectories of marijuana use may differentiate young people into divergent pathways of transitions to adulthood, which may have long-term implications.