Some of these use sensors that sniff for specific chemicals like nicotine or carbon monoxide in low amounts
Retrieved 2019-02-17
PhD Thesis (Portland State University, 2016)
While it is important to be alert to suspicious anogenital lesions, it is also important to perform a correct differential diagnosis, with consideration of conditions including lichen sclerosus et atrophicus, localized vulvar pemphigoid, pinworm infection, scabies, inverse psoriasis, atopic and contact dermatitis, perianal streptococcal dermatitis, and candidiasis
If the rooms are well-sealed, have closed doors, and maybe a towel jammed in the crack (you know, the classic move), cigarette smoke might not travel far enough, or in high enough concentration, to set anything off.Butand this is keysmoke particles are persistent