social effects of smoking cigarettes can lead to isolation and loneliness The social gradient in smoking:

Burning plastics can release toxic chemicals, and materials contaminated with heavy metals can release ash containing toxic metals

Wherever you stand on this debate, the discussion must continue as to how we deal with smoking in the workplace

Immune response suppressed Acrolein is toxic and damages genetic material

It is perhaps natural that efforts should be made to discredit evidence which suggests a different view. Though Fisher was in the minority, he was not alone in taking this different view. Joseph Berkson, the chief statistician at the Mayo Clinic throughout the 1940s and 50s, was also a prominent skeptic on the smoking-cancer question, as was Charles Cameron, president of the American Cancer Society

Its worth noting that TSA screenings are focused on threats to aviation and passengers and officers do not search for marijuana or other illegal drugs, according to their site