"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)."
Source
"The Importance of Family Dinners VIII: A CASAColumbia White Paper," The National Center on Addiction and Substance Abuse, New York, NY: September 2012.