Nah, that's a myth, Euro. I assume you're referring to your torso, and not the Foster's in the fridge? You'll be able to work out much better with cleaner lungs, you're less likely to be crippled by a stroke and gimp about drooling at a relatively young age, with everyone saying smugly, 'oh, he brought it on himself, y'know', and you'll smell divine. Think of something else to spend the considerable savings on - more bets, more body oil, more full body massages...
Seriously, if you approach it with the view that you'll just try giving up for a week, not approaching it as if it's some sort of inquisitorial ordeal to go through, then just take it a day at a time. Softly, softly, catchee monkey...