When examined by age, young adults were at highest risk for marijuana use disorder in both surveys. Clearly, concerns about this age group continue,7 with prevention and intervention efforts for this group critically needed. However, the relative increases in adults aged 45 to 64 years and 65 years and older were much greater than the increases in young adults. Older adults are also at increased risk for adverse consequences of marijuana use, including intoxicated driving,77 injury other than road crash,78 and worse treatment outcome for trauma79 and depression.80 Therefore, concerns about increases in marijuana use and marijuana use disorder among middle-aged and older adults are warranted.
