Comparing the cancer potencies of emissions from vapourised nicotine products including e-cigarettes

[5150sick]

http://tobaccocontrol.bmj.com/content/27/1/10

 

[Rossum]

tl;dr: The cancer risks from vaping are between orders of magnitude less than smoking. The only real question is: How many orders of magnitude? Most of the data clusters between two (100x less) and four (10,000 times less).