how dangerous is tobacco can be bad for your health even if you are not the one smoking. Breathing in the smoke can lead to many health problems. Vaping also bad for you. E-cigarettes Chemicals in Cigarettes and Tobacco:

smokefree.gov via @FDATobacco Join the conversation

If we would make forbidden all that science has deemed potentially destructive, well are lives would be a lot less interesting(or more depending on how one sees it) This may not answer all your points, but bear in mind that smoking is inherently dangerous, whereas some of the things you mention (e.g

Then you need to decide which e-liquid to use

Your wet waste is your fruit peels, leftover foods, while your dry waste is your plastics, nylons, paper bags, put these waste separately

Tackle the HVAC System Even if your surfaces are clean, smoke smell can keep circulating through your vents