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In page Construction of electronic cigarettes:

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Vaping typically gives a lower amount of nicotine per puff than smoking cigarettes.[5] E-liquids contain nicotine in a variety of different strengths.[6] From no nicotine[7] to 36 mg/ml.[8] On average a regular cigarette contains 6–28 mg of nicotine or the user will inhale about 1.1 to 1.8 mg of nicotine if just a portion is used.[citation needed] On average an e-cigarette contains 0.5–15.4 mg of nicotine per 15 puffs.[citation needed] In practice, the nicotine concentration in an e-liquid is not a reliable guide to the amount of nicotine that reaches the bloodstream.[9]