TY - JOUR T1 - Marijuana use by tobacco smokers and nonsmokers: Who is smoking what? JF - Canadian Medical Association Journal JO - CMAJ SP - 1399 LP - 1399 DO - 10.1503/cmaj.051614 VL - 174 IS - 10 AU - Scott T. Leatherdale AU - Rashid Ahmed AU - Murray Kaiserman Y1 - 2006/05/09 UR - http://www.cmaj.ca/content/174/10/1399.abstract ER -