"There's a lot we don't know about them."

The stark truth is, nicotine is one of the most additive substances there is, if not the most addictive substance in the world. It does not help that tobacco companies adds over 601 chemicals to tobacco to make them more addictive. It is extremely difficult to keep people from smoking once they start.

(See: Dutra LM, Glantz SA. Electronic cigarettes and conventional cigarette use: a cross-sectional study. Published online March 6, 2014. JAMA Pediatr. doi:10.1001/jamapediatrics.2013.5488.)

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