(Effectiveness of Federal Prevention Messages, 1998) "Youths who used illicit drugs in the past year were significantly less likely than youths who had not used drugs to report that they received prevention messages in a special class about alcohol or other drugs at school or as part of another regular class, such as a health class, although these differences were not large.

(Past Year Marijuana Use and Exposure to Prevention Messages, by Race/Ethnicity)
"• Exposure to prevention messages in the media was significantly associated with lower odds of past year marijuana use for whites and Hispanics, but not for blacks or youths in the 'other' category.
"• Higher levels of parental communication about substance use were significantly associated with lower odds of past year marijuana use among Hispanic youths, but not among youths of other racial/ethnic groups.

(Exposure to Prevention Messages by Youth In and Outside of School, 2012)

(Importance of Family Dinners in Substance Use Prevention) "Compared to teens who have five to seven family dinners per week, those who have fewer than three family dinners per week are twice as likely to say they expect to try drugs (including marijuana and prescription drugs without a prescription to get high) in the future (17 percent vs. 8 percent)."