Early exposure to drugs, alcohol creates lifetime of health risk / EurekAlert, 16 October 2008
http://www.eurekalert.org/pub_releases/2008-10/du-eet101608.php
"People who began drinking and using marijuana regularly prior to their 15th birthday face a higher risk of early pregnancy, as well as a pattern of school failure, substance dependence, sexually-transmitted disease and criminal convictions that lasts into their 30s."