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In page Composition of electronic cigarette aerosol:

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Cig-a-likes and tanks are among the most popular devices.[citation needed] But tanks vaporize nicotine more effectively, and there are a greater selection of flavors and levels of nicotine, and are usually used by experienced users.[citation needed] Under five minutes of cig-a-like vaping, blood nicotine levels can elevate to about 5 ng/ml, while under 30 minutes of using 2 mg of nicotine gum, blood nicotine levels ranged from 3–5 ng/ml.[15] Under five minutes of using tank systems by experienced vapers, the elevation in blood nicotine level can be 3–4 times greater.[15]