"Smoking tobacco was illegal during the Qing Dynasty, but the use of snuff
was allowed because the Chinese considered snuff to be a remedy for
common illnesses such as colds, headaches and stomach disorders." (Wikipedia)
So, all you smokers, if it ever gets to where the Leftist do-gooders make cigarettes illegal, you can push for the same sort of tobacco exemption as the potheads have been trying to get for their pet plant.
(Imagined scenario during Qing Dynasty: a young boy, around 10, decides to wangle some of Grandpa's snuff.
Boy, groaning and rubbing abdomen: "Grammy, I'm feeling really sick to my stomach."
Grammy: "Here, my boy, take some of Grampy's snuff to make it feel better.")