@Foofie,
it is not in the Army's interest to end the craving, the fact that the Army could help get rid of the craving is irrelevant. The Army has zero care if its soldiers are drugged up on legal substances, so long as they get the job done. If the substances help get the job done the Army will help to make it happen. If you need a prescription stimulant then the doc will fix you up. If you need tobacco to calm down and to relieve stress the 1sg is going to tell the platoon sgt's to let the soldiers light-up, no matter what the DA directives are.
The concept of smoking being illegal in the civilian word is warped, we are not that stupid yet. We still remember Alcohol prohibition, and the war on drugs. Your entire premise is deeply flawed.