As I recall, my first few days at MCRD San Diego were less than comfortable as my schedule was never in line with the Marine Corps. They wouldn't let me smoke when I wanted, nor could I do anything else. I made a large mistake by inquiring if it would be possible to switch services.
In an instant, I had a special meeting with three huge Drill Instructors, whose names are "seared in my memory." They gave me two options: "I could go out in a box or I would graduate a U.S. Marine."
Obviosuly, I decided on the latter and decided that it would be healthier to smoke when the smoking lamp was lit. I concur that it is not too easy to get out of Boot Camp and now I am forever in debt to those three Drill Instructors who at the time had convinced me that they did indeed have that box.
Semper Fi!