Stigma and discrimination experienced during adolescence can have lifelong health consequences.1 In addition, risky health behaviors are often established during adolescence and can be particularly prevalent among those aged 13 to 18 years experiencing stigma. Lesbian, gay, and bisexual (LGB) adolescents are at higher risk for stigma and discrimination than their heterosexual (straight) counterparts.1 If LGB adolescents are also more likely to develop risky health behaviors, they will also be at higher risk of adverse health consequences than straight adolescents. However, the prevalence of risk behaviors among LGB adolescents has not been previously estimated in national surveys.