is it okay to smoke one cigarette a day Even too many Why You Should Quit Smoking
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Smoking behaviors have the same magnitude of effect on mental health hospitalization as genetic liability. So, if a person is genetically predisposed to smoking heavily, this same genetic factor could also increase their chances of being hospitalized due to severe mental health conditions

Both smokers and vapers showed abnormal expression, or deregulation, in a large number of genes linked to cancer development

J Cardiothorac Vasc Anesth

Retrieved 2008-03-17
While delivery methods differ, nicotine affects the brain in similar ways across all forms, reinforcing use and increasing dependence over time
