Anchorhead said:

I find it particularly strange that people only in their twenties smoke. It's no longer a maybe it's bad for you deal.

I've seen a list just like this one at my doctor's office. Very interesting how fast your body starts to recover.

Interestingly, that's the reason my former roommate gave me for why she had smoked when she was younger. According to her, since your body just recovers from it anyway, why not enjoy yourself in your twenties by smoking? I admit I didn't get it. And I suppose that precludes that you will stop at some point...