electronic cigarette smoker 59,723 E Royalty-Free Images, Stock Photos & Pictures E-cigarette flavors are toxic to

Many of these center on the fact that marijuana is a naturally occurring substance, hence its names including herb, grass or weed. While it may be true that cannabis can be found in nature, this does not by any means make it safe

Supermarket chain Kroger and drugstore chain Walgreens announced they would discontinue sales of e-cigarettes at their stores nationwide, citing an uncertain regulatory environment

CNBC's Angelica LaVito contributed to this report.

Image Duncan Williamson lighting up a fag Photographer Summary Williamson lighting up a fag (cigarette) in the living room of his home at Kincraigie Farm Cottage, near Strathmiglo, Fife

All devices must comply with UK capacity and nicotine regulations

Over that time, we have seen many brands come and go