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Authors' contributions All authors participated to the design of the study

They may trap the final traces of stains and odors

Mechanisms Nicotine is a well-established respiratory irritant 58 , but other chemicals in e-cigarettes (e.g., diacetyl 59 , propylene glycol, carbon monoxide, and formaldehyde 60 ) also have detrimental effects for lung function including respiratory volume 61

Charlie the smoking chimpanzee has died

For example, when studying soda taxes, economist Roland Sturm concluded that "Small taxes will not prevent obesity." Sturm determined that taxes would need to hit about 18 cents per dollar to affect behavior