Tobacco/Weed split thread.

[Bebek Sincap Ratatosk]

http://www.abstractsonline.com/Plan/ViewAbstract.aspx?mID=3086&sKey=3e3df4f9-a49f-40e7-a260-ccc3c54e0125&cKey=c7c6690d-3e5e-438e-9de4-d6f67a0703fb&mKey=9b2d28e7-24a0-466f-a3c9-07c21f6e9bc9 (from this year)

Conclusion
Our pooled results showed no significant association between the intensity, duration, or cumulative consumption of cannabis smoke and the risk of lung cancer overall or in never smokers. Cannabis use is under international control and its legal status varies, so reporting bias is of concern. However, since the reported prevalence in our data is comparable to nation-specific survey results and not differential between cases and controls, it is unlikely to fully explain the lack of significant association. Our results cannot preclude the possibility that cannabis may exhibit an association with lung cancer risk at extremely high dosage. We will also present data after applying restricted cubic splines to explore non-linear relationships.

Just the abstract, it would be nice to have access to the full paper.