[Alupis]

The difference between caffeine and the chems in e-cigs is that caffeine consumption typically only involves the user. Where-as e-cig consumption too often involves the user, plus all those stuck in the same room/elevator.

If this were a nicotine patch, it wouldn't be such an issue.

[tptacek]

E-cigs do not dose bystanders with nicotine.

[Alupis]

They do, plus other chemicals either in the liquid vapor, or created by the heat in the vape.[1][2][3]

[1] http://www.medicaldaily.com/secondhand-smoke-goes-electronic...

[2] http://www.medicalnewstoday.com/articles/281762.php

[3] http://www.webmd.com/smoking-cessation/news/20140903/e-cigar...

[tptacek]

None of these links suggest that bystanders are dosed with nicotine by e-cigarettes.