Read a story about a Naval officer who was having his lung problems treated back in the early 1930s.
The treatment was to have a doctor stick a needle in their chest and draw out all the air from the affected lung. That gave the lung a chance to heal.
While the lung was reinflating, the officer would lie in bed and smoke a cigarette to relieve the stress.
1912 article dscribing the process
As a former smoker, I can attest that camels are the healthiest cigarette brand. I'm still alive after smoking them for years at least.
I smoked Marlboros for a long time. Unfortunately, I am now dead but the cowboy in me lives on!