1 Leslie Iverson. 2005. Long-term effects of exposure to cannabis. Current Opinion in Pharmacology 5: 69-72.

2 The Beckley Foundation. 2006. Cannabis and Mental Health: Responses to Emerging Evidence.

3 London Telegraph. "Cannabis use will impair but not damage mental health." January 23, 2006.

4 Fergusson et al. 2006. Cannabis and psychosis. British Medical Journal 332: 172-175.

5 Wayne Hall. 2006. The mental health risks of adolescent cannabis use. PLOS Medicine 3 (open access journal).

6 Semple et al. 2005. Cannabis as a risk factor for psychosis: systematic review. Journal of Psychopharmacology 19: 187-194.

7 Malik and D'Souza. 2006. The association between cannabis and psychosis. Psychiatric Times. 4 (open access journal).

8 Harder et al. 2006. Marijuana use and depression among adults: testing for causal association. Addiction 10: 1463-1472.

9 Weiser and Noy. 2005. Interpreting the association between cannabis use and increased risk of schizophrenia. Dialogues in Clincal Neuroscience 1: 81-85.

10 Ferdinand et al. 2005. Cannabis use predicts future psychotic symptoms, and vice versa. Addiction 100: 612-618.

11 Ashton et al. 2005. Cannabinoids in bipolar affective disorder: a review and discussion of their therapeutic potential. Journal of Psychopharmacology 19: 293-300.

12 Boydell et al. 2007. A comparison of symptoms and family history in schizophrenia with and without prior cannabis use: Implications for the concept of cannabis psychosis. Schizophrenia Research [E-pub ahead of print; Abstract online April 31, 2007].

13 London Telegraph. op. cit.

14 Office of National Drug Control Policy Press Release. "White House Drug Czar, Research and Mental Health Communities Warn Parents That Marijuana Use Can Lead to Depression, Suicidal Thoughts and Schizophrenia." May 3, 2005.

15 According to national data compiled by the University of Michigan, 86 percent of 12th graders say that marijuana is "fairly easy" or "very easy to get." Some surveys note that teens respond that marijuana is now easier to obtain than alcohol; See: Associated Press. "Teens Say Buying Dope Is Easy." August 19, 2002.

16 Office of National Drug Control Policy Press Release. op. cit.

17 Czyzewska and Ginsburg. 2006. Explicit and implicit effects of anti-marijuana and anti-tobacco TV advertising. Addictive Behaviors [E-pub ahead of print; Abstract online May 1, 2006].

18 Westat et al. 2006. Evaluation of the National Youth Anti-Drug Media Campaign. Washington, DC: National Institute of Drug Abuse (NIDA).