I know this blog will be read with great hostility by smokers and anti-smokers. Nearly every American believes second hand smoke has harmful health effects.
I can live with this outcast status and always have.
Nearly all anti-smoking regulations are founded on the argument that secondhand smoke does a great deal of harm to people who are exposed to it.
Smoking is banned in work environments where people deliberately have gone to smoke, such as bars. The ostensible reason is of the employees who don't smoke will be hurt by secondhand smoke.
Smoking is banned on public streets in many areas, in common areas of buildings universally, on beaches in Santa Monica, and in parks in many other areas. This is all ostensibly because of the harm from secondhand smoke.
Restaurants and coffee shops are not allowed to have separate sections for smokers because the smoke seems to convey illness and death through the air.
I cite one example here that explains that no reliable study has ever shown a connection between secondhand smoke and any physical harm.
I personally read many studies in the late 1980s and early 1990s from Japan where very reliable studies have been done on married couples living in small confined Japanese homes. One person smoked for a lifetime and the other didn't. The one who didn't smoke had no shorter lifespan or higher morbidity than comparable homes where neither person smoked.
All such studies were removed from the good libraries that I visited in San Francisco, from the Library of Congress, and in Japan.
The anti-smoking group is much more ferocious, more tyrannical and nastier than the crew who support the human-caused-global-warming scam. Both groups believe that any distortion of the data or suppression of results is justified because they are 'right'.