MistBusters compare cigarette smoke with vapor by blowing it through a paper towel. Can you guess which one left a stain?
They mention that 4,000 different chemicals are in cigarettes, 60 of these are cancer causing. They also acknowledge that there is no official FDA research in what is in e-juice.
Sure, this experiment may not be the most accurate, it is just a visual comparison of the smoke and vapor being released by the two. It compares what is likely to be left in our lungs between smoking and vaping. Simple but very logical.