Prevalence of substance abuse problems much higher in gay youth.

A meta-analsis published in the March, 2008 issue of the journal, Addiction, found that substance abuse is much higher in teens with a same sex sexual orientation.

Here are the conclusions as stated in the abstract:

The odds of substance use for LGB youth were, on average, 190% higher than for heterosexual youth and substantially higher within some subpopulations of LGB youth (340% higher for bisexual youth, 400% higher for females). Causal mechanisms, protective factors and alternative explanations for this effect, as well as long-term substance use outcomes in LGB youth, remain largely unknown.