Well, I think how safe they actually are is still a matter of opinion. But, I do know that you aren't actually smoking and inhaling the carcinogens. E-cigs are different but I guess no one has proven the stuff they add to the nicotine cartridges aren't just as dangerous.

My preference is at least if this person I know smokes an e-cig, maybe she won't at least inhale the chemicals in tobacco. JMO.