What happens if you have all 12 badges and you relapse?
Are your badges taken away if you've started back smoking? Do they have a 13th badge for relapsing?
If I had 12 badges and was smoking again, I would be too embarrased to admit I smoked.
And what about the "pillar of the community standing" 12 badges gives you in the eyes of someone
who has just joined the site? They don't know you've started smoking again.