No, this is not a variant on the old joke of "You can always tell a chili addict, but you can't tell him much!" (But that is true, by the way.)
This is about distinguishing the creature from other, lesser, forms of homo sapiens. Here are a few tips that might help.
1. Does he get a distant, glazed stare when the talk turns to favorite foods?
2. Is his pantry full of dried pepper pods and bags of various sorts of ground and powdered chili?
3. Does he have at least one crock pot devoted solely to the preparation of chili and does it sometimes stay plugged in all day?
4. Does he begin to sample the latest batch before it is even completely hot?
5. Does he keep a big spoon next to the pot, and is the amount of chili that finally makes it to storage (or a bowl!) far less than what the pot originally held?
If you can answer YES to any one of the above questions there is a very great chance that you are dealing with an addict. If YES to all of them, there is no question about it. You are faced with a confirmable case.
Institutionalization will not help. He's usually not dangerous, unless you accept a bowl of chili from him and are gullible enough to believe him when he says "It's not really hot."