People have turned to “vaping” with electronic cigarettes as an alternative to puffing on the real thing. But Is that vapor you’re inhaling any safer than taking a drag on a cigarette? This week, Reactions examines what we know, and what we don’t, about e-cigarettes. Big thanks to Andy over at Compound Interest. There's also a cover story from Chemical and Engineering News on the topic: http://cenm.ag/ecigarette.