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Toxicol Sci 96:2129 Shin VY, Jin HC, Ng EK, Yu J, Leung WK, Cho CH, Sung JJ (2008) Nicotine and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone induce cyclooxygenase-2 activity in human gastric cancer cells: involvement of nicotinic acetylcholine receptor (nAChR) and beta-adrenergic receptor signaling pathways

PubMed Central , Joe-Sub

The study had also found that a large proportion of students (43.7%) had previously tried e-cigarettes 18 , highlighting that many young adults have previously experimented with e-cigarettes

Econ Pap: A J Appl Econ Policy, 31:30317 World Health Organization

This takes some practice, which is why experienced vapers often feel the effects of nicotine more efficiently than beginners