In Canada, 3 pharmacotherapies (bupropion, nicotine replacement therapy [NRT], varenicline) are approved for smoking cessation,15 , 16 with others available as approved natural health products (e.g., cytisine).16 E-cigarettes (also referred to as vaporizers, vapes, or electronic nicotine delivery systems) might also help users quit tobacco smoking or reduce harms of smoking if a person switches from cigarettes to e-cigarettes.17 No e-cigarette products, however, have been approved for smoking cessation in Canada.18 Preferences for smoking cessation interventions vary, and people may attempt to quit multiple times with different interventions or combinations of interventions before being successful.19 This guideline provides a menu of evidence-based interventions that can be provided or referred to by practitioners to help adults choose options that are accessible to them and best fit with their values and preferences

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However, for heavy smokers or those who use nicotine frequently, this duration can extend to 4 to 5 hours or more
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Understanding Smokings Effect on Your Blood Vessels Among other side effects, smoking does cause blood vessels to constrict