I think I've seen him play a few times. I know I've seen him sitting AFK for hours. I guess he's using Quake2 multiplayer as a screensaver.
Nicotine has never been addictive to me, whatsoever, no matter how many years I've smoked or how many I smoke a day.
Just kick him out or stuff command "spectator 0" on him. Fifteen hours in spec mode, gtfo man!