Some ideas:-
1)Switch from the one drug to another. All these drugs cause addictive feelings in the brain via opioids/changing neurotransmitter levels etc. He could also go in for potentially addictive pursuits such as gambling or whatever physical or mental pursuit he excels in and gets a rush out of.
2) Take snuff instead of the cigarettes. That way, he at least avoids getting the harmful effects of the cigarette-smoke while still getting his nicotine-hit. Or he could go in for nicotine-patches on his skin.
3) Visit one of the few public areas left in major government/business buildings where smokers are allowed to smoke uninterrupted. Here in Austria, it has become illegal to smoke outside, so there is a designated large room in every major office-building/government-building where smokers can go. I have occasionally been inside a few of these rooms, and the smoke therein is so dense and disgusting, I would imagine that it would be a great disincentive as regards smoking.
4) Use a vaporiser on his body or put an ultrasound humidifier in his room with eucalyptus essential oil in the aromatherapy-oil tray, so as to help clear his airways of smoke-particles etc.
5) Go in for a series of water-fasts to enable the body to detox some of the smoking-derived toxins from his body.
