[mistercow]

No. There are numerous studies demonstrating that they are safer. Here's one: http://publichealth.drexel.edu/SiteData/docs/ms08/f903492642... . Here's another: http://tobaccocontrol.bmj.com/content/early/2013/03/05/tobac...

Also, without direct evidence or rigorous analysis it would still be preposterous that a mixture of nicotine, fragrances, propylene glycol, and vegetable glycerine would be anywhere near as harmful to the lungs as cigarette smoke. There is a difference between "just assuming" and applying common sense.

[dhughes]

You would think common sense would say "only put air in your lungs".

[mistercow]

No, the prior for "air is the only safe thing that can go in your lungs" is very low.