It's the residue from smoke that settles onto clothes, hair, furniture or anything else in a smoker's vicinity
Public policy (most notably, the 1964 Surgeon Generals report, which linked smoking to lung cancer) managed to curb smokings stratospheric popularity, but it didnt result in a massive reduction in the overall quantity of smokers
I can remember my mother and her friends laughing at that joke until they cried
Image from AAN website (www.allergyasthmanetwork.org) 1987 Montreal Protocol The Montreal Protocol banned the use of chlorofluorocarbon (CFC) propellants as used in metered-dose inhalers
Journal of Thoracic Oncology 13 , 480487, (2018)
This guide therefore ranks both brand families and individual products, while clearly identifying which type each entry represents