Like SeaBreeeze, I know of someone who was disfellowshipped for smoking. She was the mother of my best friend at the time. Her husband had researched The Watchtower and he did not like them. Her name was Ella. She was unable to give up smoking, and she was disfellowshipped. I was a kid at that time and thought, "Too bad, but them's the rules."
Because I was an ignorant thoughtless child, like the "Elders" who invented and enforced this terrible treatment of fellow humans.
I don't smoke; never have, never wanted to try it, so I don't encourage anyone to smoke.
Anything.
I also think it is immoral to destroy a person because they smoke. Ella died disfellowshipped. Her own son didn't speak to her after her disfellowshipping.