Sexual minority youth (SMY) and heterosexual youth differ in substance use rates, with SMY-females showing higher use of cannabis, ecstasy/MDMA, and hallucinogens at age 17, and also tobacco and stimulants by age 20. SMY-males reported lower tobacco and cannabis use at age 17 but higher ecstasy/MDMA and hallucinogen use at age 20. Psychosocial factors such as internalizing symptoms, self-control, and peer influences partly explain these differences. The findings highlight the need for targeted prevention, especially for SMY-females early in life.
Frequent cannabis use in young adulthood predicts increases in psychotic-like experiences, internalizing symptoms, aggression, problematic substance use, and higher odds of not being in employment, education, or training, along with decreased general well-being from ages 20 to 24. These associations held whether cannabis exposure was measured by self-reported frequency or by hair THC concentrations, and effect sizes were small. Composite measures combining self-reports and hair data were no more informative than either source alone. The findings come from a community sample of 863 young adults, with 150 reporting weekly-to-daily use and 110 having detectable cannabis in hair at age 20.