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Participants in clinical trials are encouraged to completely switch from cigarettes to e-cigarettes to minimize dual use, which has been shown to be harmful and may make it harder to quit tobacco use, says Maya Vijayaraghavan, MD, a professor in the Department of Medicine at the University of California San Francisco (UCSF) School of Medicine and the director of the UCSF Smoking Cessation Leadership Center

For example, defective transport of tryptophan into cells results in Hartnup disease, which features signs of severe niacin deficiency (74)

For 3R4F cigarettes, the longer puff duration (4-s puff) increased the percentage of the smoke production over the total smoke produced as compared to the 2-s puff duration

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The increasing size and strength of disposable e-cigarettes have resulted in a generation of products with nicotine levels comparable to several cartons of cigarettes