"Compared to teens in families with strong Family Ties, teens in families with weak Family Ties are:
"• Four times likelier to have tried tobacco;
"• Four times likelier to have tried marijuana; and
"• Almost three times likelier to have tried alcohol."

Source

Knowledge Networks and QEV Analytics. National Survey of American Attitudes on Substance Abuse XV: Teens and Parents. New York, NY: National Center on Addiction and Substance Abuse at Columbia University, August 2010.