A 2010 CDC study found higher levels of tobacco smoke by-products in people who lived with smokers, especially children, and that, Secondhand exposure to tobacco smoke causes heart disease and lung cancer in nonsmoking adults and sudden infant death syndrome, acute respiratory infections, middle ear disease, exacerbated asthma, respiratory symptoms, and decreased lung function in children. A study in the Journal of Epidemiology and Public Health found that, When compared with never exposed children, children exposed to continuous secondhand smoke scored higher on self-reported aggressive behaviour and teacher-rated antisocial behaviour in fourth gradesimilarly, children exposed to transient levels of secondhand smoke scored higher on aggressive and antisocial behaviour. As you can see from these studies, tobacco smoke is made up of gaseous toxic compounds like acetaldehyde, hydrogen cyanide, and many others

Nicotine Replacement Therapy This would include e-cigarettes, dermal patches, nicotine gums, or any other form of tobacco-less nicotine supplement
In Japan, it is called D-Spec, and the export version is called LSS
Despite this, the naturally harsher throat hit of an 18mg vape can be off-putting for some, even those who smoked heavily
McHugh, J.E