Smokers with at least 15 pack years were classified as heavy, whereas smokers with fewer than 5 pack years were classified as light
[DOI] [PMC free article] [PubMed] [Google Scholar] 111.Hom S., Chen L., Wang T., Ghebrehiwet B., Yin W., Rubenstein D.A
And thats before you start looking at property damage (three housefires a day in London alone are directly attributable to lit tobacco), pollution, etc caused by lit tobacco that either arent applicable to reduced risk products (Im quite sure Snus hasnt started any house fires, ever) or are massively reduced (The fact that battery fires related to e-cigs are newsworthy is testament to how rare they are notice how you dont see news stories about cigarette fires) by these products
Take very short, shallow inhales
Some studies would find cigar smoking to be effective in slightly increasing ones testosterone levels