Jennifer Aniston has been trying to quit smoking, but blames Vince Vaughn for her failure because he loves it so much. Everytime she whines to him about it, he just laughs it off.
Such willpower she has that she can only accomplish difficult tasks when other people have to do it too. I can also imagine that when Jennifer Aniston starts sweating, trying to resist a cigarette, Vince Vaughn lights up, blows smoke in her face and then starts laughing like he does. I’d be doing this too if I had to hear her crying over Brad Pitt every other day.