5 forward.
The main body of your post sums up why this chap had to go IMHO, and there is no need to debate whether he could control his intake, or whether he was an addict. The military are a bit touchy about people doing things secretly in contravention of rules, and with just cause usually.
I felt the need to just say that as I sometimes get the idea that the word 'addict' is very often wrongly used.
The military is full of addicts. There are still quite a lot of smokers in the military and many if them are addicted to smoking.
There are fitness addicts too.
If we turn things round a bit a smoker who is addicted to cigarettes is still an addict even if he or she hasn't smoked for twenty years!
Similarly a drug addict (illegal or prescription) can still join the military as long as they are clean and have been for a period of time.......but are still an addict.
An addict can use their drug all day long or once a week, it's the need that makes the addiction not the amount.
Sorry to bite about the word addict, but junkie was also used in this thread. Having worked in a rehab centre it was always amusing that a very high percentage of new customers assumed that the other customers were the tramps they had seen on park benches or down and outs in shop doorways and they they would be the only 'normal' person there. It was a shock for them to find out that the other addicts were shop workers, care workers, GPs, doctors, teacher and accountants..........and just normal looking people.
As is mentioned above this chap had to go as he broke the club rules.