document sources Listed from the Video page below:

1. CANNABIS USE AND RISK OF LUNG CANCER: A CASE-CONTROL STUDY
Eur Respir J. 2008 February; 31(2): 280--286. 

2. Possible role of marijuana smoking as a carcinogen in the development of lung cancer at a young age.
J Psychoactive Drugs. 1994 Jul-Sep;26(3):285-8.

3. Associations between duration of illicit drug use and health conditions: results from the 2005-2007 national surveys on drug use and health.
Ann Epidemiol. 2010 Apr;20(4):289-97.

4. Cannabis and road crashes: a survey of recent French studies.
Ann Pharm Fr. 2006 May;64(3):192-6.

5. Drugs in fatally injured young male drivers.
Public Health Rep. 1985 Jan--Feb; 100(1): 19--25. 

6. Dose related risk of motor vehicle crashes after cannabis use.
Drug Alcohol Depend. 2004 Feb 7;73(2):109-19.

7. Developing limits for driving under cannabis.
Addiction. 2007 Dec;102(12):1910-7.

8. The effect of cannabis compared to alcohol on driving.
Am J Addict. 2009; 18(3): 185--193.

9. If cannabis caused schizophrenia--how many cannabis users may need to be prevented in order to prevent one case of schizophrenia? England and Wales calculations.
Addiction. 2009 Nov;104(11):1856-61.

10. Cannabis and suicide: longitudinal study.
Br J Psychiatry. 2009 Dec;195(6):492-7.

11. Cannabis use and the risk of developing a psychotic disorder.
World Psychiatry. 2008;7(2):68-71.

12. Delta-9-tetrahydrocannabinol effects in schizophrenia: implications for cognition, psychosis, and addiction.
Biol Psychiatry. 2005 Mar 15;57(6):594-608.

13. Adverse health effects of non-medical cannabis use.
Lancet. 2009 Oct 17;374(9698):1383-91.

14. General and oral health implications of cannabis use.
Aust Dent J. 2005 Jun;50(2):70-4.

15. Adverse health effects of non-medical cannabis use.
Lancet. 2009 Oct 17;374(9698):1383-91.

16. Adverse effects of cannabis on health: an update of the literature since 1996.
Prog Neuropsychopharmacol Biol Psychiatry. 2004 Aug;28(5):849-63.

17. Evaluating the drug use "gateway" theory using cross-national data: consistency and associations of the order of initiation of drug use among participants in the WHO World Mental Health Surveys. 
Drug Alcohol Depend. 2010 Apr 1;108(1-2):84-97.

18. Does marijuana use serve as a gateway to cigarette use for high-risk African-American youth?
Am J Drug Alcohol Abuse. 2008;34(6):782-91.