are there drugs in cigarettes a Gateway Drug? How many adolescents use tobacco?

But research on effects of secondhand smoke on mental health have been really just emerging and this study really contributes to this growing body of evidence that exposure to secondhand smoke in children might be responsible for cognitive and behavioral problems, she said

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Some toxic effects induced by tobacco smoke, result from direct genetic or epigenetic effects resulting in altered gene functions (for example, cell cycle, DNA repair, and tumor suppressor genes)

The key findings were that across the 28 countries of the EU in 2017: Around 15% of those aged 15 or over had tried an e-cigarette at least once compared to 12% in 2014