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To avoid possible differences in nicotine levels, we asked all participants to smoke up the cigarette of the same brand in the smoking area next to the research room

Just with tobacco

Acknowledgements This study was supported in part by NIDA grants: 1R56DA036556, R01DA029845, R01DA030394, R01HL102119, and R21DA032022, Natural Science Foundation of Zhejiang Province Grant LZ15H180001, the program for professor of special appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and the Hangzhou Qianjiang Endowed Professor Program and the Youth 1000 Talent Program of China

These are the only e-cigarette products that currently may be legally marketed and sold in the United States

Heavy vaping can be harmful to health, so it's important to practice moderation