It is possible to passively smoke in places where smoking is banned, because harmful tobacco chemicals remain on people’s bodies and clothes and in the air
Source:
https://www.newscientist.com/article/2236176-smoking-bans-dont-prevent-you-having-to-breathe-in-smoke-particles/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home