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[93] A 2016 study also supported this finding: English children aged 11 to 16 who were exposed to e-cigarette advertisements that highlighted flavored, in contrast to flavor-free e-cigarettes, reported increased e-cigarette appeal and usage of e-cigarettes

Int J Environ Health Eng 9:13 Marah M, Novotny TE (2011) Geographic patterns of cigarette butt waste in the urban environment

Second-hand smoke from cigarettes has been shown to be injurious to bystanders, which has led to legislation that has prohibited smoking in many workplaces and public areas

For example, lets say were interested in studying lung cancer and smoking