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Residual confounding from unmeasured variables such as genetic susceptibility, dietary factors not fully captured, and environmental exposures cannot be excluded

In addition, packaging-related ML (40 categories) and lids (6 categories) were grouped separately as they are subordinate groups of levels two and three

Teens should avoid nicotine as it causes long-term changes in the brain that may make it difficult to quit nicotine products. Despite being aware of the harmful health consequences, Kenny said he uses ZYN and other substances together because of the de-stressing effects he gets from combining drugs

J Endocrinol Invest (2018) 41(12):141723