There is a lot of misinformation here.
Caffeinated coffee is available daily up until 10:00am. Access to caffeine is restricted because a good part of the population is there for stimulant addictions. There are also individuals coming off of multi-day meth binges. The last thing you want is someone struggling with drug induced pychosis to be more awake.
Nicotine, while granted is a stimulant, is another story. The comment about "good rehab result' is utter bullshit and I can't imagine that ever coming out of a counselor's mouth. While I recognize a potential philosophical conflict regarding allowing one addiction while fighting another, it really comes down to harm reduction. Residents are often painfully detoxing off of some severe chemicals and use patterns. They feel itchy enough as it is without throwing another physical and mental obstacle at them. Cigarette smoking didn't create the chaos and consequences in their lives that landed them in a treatment facility. That is simply not why they are there.
As to the comment about people "smoking everywhere".....more bad info. There is one designated place to smoke and there are specific times when it's allowed. It's hardly the free-for-all you describe.
I sincerely hope your son is doing well.