I was talking with Gary Becker, a Nobel laureate economist, a while back about addiction (among his many other accomplishments, Becker introduced the idea of rational addiction).
When he told me his opinion as to the most addictive good, I was initially surprised and skeptical. On further reflection, I believe he is right.
So here is the quiz: what does Gary Becker think is the most addictive thing on earth?
Freakonomics schwag to the first person to post the right answer in the comments.
Addendum: The answer and the winners are announced here.
and 
. You can also watch it on 
Religion… or maybe power.
Nicotine
oxygen
Hands down, I would be inclined to say coffee is the most addictive thing on earth.
Society or human companionship. Not required for physical existence, but deprived of it, a person can go into withdrawal.
Money? Or rather, buying stuff.
Internet Gambling, or Video Games.
Money?