Others have designated smoking as a medical condition owing to its physiological addictive qualities. Taking that stance I would just note that the United State

Others have designated smoking as a medical condition owing to its physiological addictive qualities. Taking that stance I would just note that the United States Navy bans from operating certain equipment all sorts of people with medical conditions. For example the USN wouldn’t let me, with my 20/400 vision uncorrected anywhere near an F-35C. So I can see banning active smokers from submarines.