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10.1136/tc.2010.037630

Adults: Behavioral Risk Factor Surveillance System, Annals of Internal Medicine , August 28, 2016, [xii] Lindsey Stroud, Randomized Trial Finds E-Cigarettes Are a More Effective Smoking Cessation Tool than Nicotine Replacement Therapy, Research & Commentary , The Heartland Institute, February 11, 2019,

Protamines are proteins smaller than histones that enable the further condensation of DNA in spermatozoa

Johnson started smoking when he was 13

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However, due to the small number of studies and lack of data on long-term nicotine-containing electronic cigarette usage usage over more than two years questions remain about long-term effects. The researchers conclude that more evidence, particularly about the effects of newer e-cigarettes with better nicotine delivery than earlier ones, is needed to assist more people quit smoking