tobacco plant uk (Nicotiana tabacum) Nicotiana mutabilis | colour-changing tobacco

The levels it reads are designated nonsmoker, light smoker, smoker and heavy smoker

[11] Shu Wang, David Merriman, and Frank Chaloupka, Relative Tax Rates, Proximity, and Cigarette Tax Noncompliance: Evidence from a National Sample of Littered Cigarette Packs, Public Finance Review 47:2 (March 2019): 276-311

as noted in the introduction, this is illogical, as such deaths would not occur among non-smokers if no one smoked

"Or we indulge in a little something else." From irritation, to speech, to terror

Steps to Take If Rodents Are in Your Air Ducts January 2, 2020 Mice and even rats can look adorable in a pet store

PMID 24575986