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In page Composition of electronic cigarette aerosol:

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Newer e-cigarette models deliver nicotine to the blood quicker than with older devices.[16] E-cigarettes with more powerful batteries can delivery a higher level of nicotine in the e-cigarette vapor.[17] Some research indicates that experienced e-cigarette users can obtain nicotine levels similar to that of smoking.[18] Some vapers[notes 1] can obtain nicotine levels comparable to smoking, and this ability generally improves with experience.[citation needed] E‐cigarettes users still may be able to obtain similar blood nicotine levels compared with traditional cigarettes, particularly with experienced smokers, but it takes more time to obtain such levels.[20]