tobacco spit pottery Barrel Mug in Glaze, 4"h (Ben Owen Sr.) – Ben Owen circa the 1960s vtg tobacco spit glaze pottery
Description
doi: 10.1111/j.1600-0714.1994.tb00258.x

Supply and demand, I believe, would be the answer
With time, the mucus in the respiratory passages may thicken as a result of exposure to smoke
I however do see issues with advertising that sees non-smokers being pushed to smokers

The Treasury, New Zealand Government