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. 2014 May 16;111(20):349–355. doi: 10.3238/arztebl.2014.0349

Figure 2.

Figure 2

Reduction in craving to smoke following use of various nicotine-containing products—tobacco cigarette (blue), e-cigarette (ENDD: electronic nicotine delivery device) with 16 mg cartridge (red), nicotine inhaler (gray)—versus nicotine-free e-cigarette (0 mg) (olive green); (according to Bullen C, et al.: Effect of an electronic nicotine delivery device [e cigarette] on desire to smoke and withdrawal, user preferences and nicotine delivery: randomized cross-over trial. Tob Control 2010;19: 98–103. Reproduced with the kind permission of BMJ Publisher Group Ltd.) (15)