Millions of people are exposed to secondhand smoke every day. People living in multi unit housing are some of the most exposed. The only way to fully protect people from secondhand smoke at Secondhand Smoke and Electronic Cigarette Aerosol Resources US EPA Another Gross Reason to Put Down the E Cigarettes American Lung Association Research is still evolving, but evidence continues to point to a link between smoking and breast cancer risk. From firsthand and secondhand smoke to vaping and cannabis, here's what scientists knowand what While vaping is not risk free, it is less harmful than tobacco Our World in Data Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center