For a moment set aside your position for/against smoking, and instead focus on a hidden level of ridiculous truth in this reasoning. I, for one, related to this person's explanation and feel that 'escaping' is a benefit to cigarettes. Even if we broaden this rationale to say that "it's just cool to step outside with other cool people and be cool" -or whatever- I think that most people could understand the argument and it would make sense. Sort of.
But, if you look again, it doesn't. And it doesn't have anything to do with smoking!
Take a girl, for instance, who wants to be able to escape a party when she starts to feel a bit crowded. Maybe some lacrosse player, hopped up on family money and Mountain Dew, decides to convince her repeatedly that she is, in fact, meant for him. Or maybe some guy gets momentarily bored when he becomes not-the-center-of-attention and wants to sneak out a bit before he's spotted not being the king.
If either of these people were to say "Excuse me please, I'm awkward right now and I'd like to stand outside alone or in a small group and be away from this area for a brief time" the people around them would think they were crazy! If, however, they decide to step out for a smoke? Well that's perfectly normal. Regrettable, you might think- given the health concerns- but normal nonetheless.
So let's review. Standing outside for a few minutes to escape? Weird. Going outside to purposefully inject your body with dangerous chemicals that have been linked to diseases as wide-ranging as cancer and malaria (made that second one up)? Normal. Poor choice, perhaps, but normal.
Something's wrong with that. Not wrong enough that I'm going to not step outside in approximately 3 minutes and smoke, but still- kinda wrong.