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Prior to 2015 and the introduction of JUUL to the vaping market, most e-cig products contained between 1% and 2.4% nicotine

Psychological dependence is not exempt in any case, neither for CBD nor for any other substance, since it is marked by psychological factors and consumption habits implicit in each individual (6)

[1] Nonetheless, for male and female young adults between the ages of 16 and 17, the primary source of cigarette accessibility was through illegal purchases in stores, as 45% of females and 55% of males in this age category reported to have purchased their own cigarettes

The initial devices were generally rather large, bulky, and cylindrical in shape

"From what we can tell, it's still harmful to the baby so people shouldn't have e-cigarettes when they're pregnant." Follow @BBCNewsbeat, external on Twitter, BBCNewsbeat, external on Instagram, Radio1Newsbeat, external on YouTube and you can now follow BBC_Newsbeat on Snapchat