Weed, nah?
But if she smokes because she's attractive, then yes. As in she's hot. As in she's on fire. As in I need to get her wet, and fast.
...
Okay, time for a serious response. It wouldn't make me think she's more attractive, nor would it make me think she's less attractive. It'd all depends on her personality. From what I've observed around me, smoking is one of those things that are brought on by peer pressure (not always of course). I've only met a few that in a sense, said, "I woke up one day and I wanted to smoke." Mostly everyone I know that smokes was influenced by friends or family members. Especially when it comes to weed, it's not like it's legal. So people normally have to know someone, or know someone that knows someone.
"Dude, almost all behavior is influenced."
True, but not all behavior is notorious for being dangerous. I'd like my girl to be more strong-minded than that, and not be easily persuaded into committing an act that is known for causing health problems. Of course, it could be a mistake judging how easy she is to influence on that alone. For example, she could have made that decision when she was really young, and got addicted to it. She could have a very strong mind when it comes to being influenced, but is simply having trouble dropping something she's been doing for years. She could even be thinking about quitting, and the cigarette/weed I see her smoking is her only one in 1-2 months, when before she would smoke once/several times a week.
It's not really good to always judge. I'd prefer for her not to smoke, but if she's a really awesome person, then I could most likely look pass it. I'd have to get to know any girl I'm considering dating anyways, so I'd have to see how everything plays out.
Would I look for a girl that smokes? Not at all. It'd probably have to be one of those things that sneaks up on me, and before I know it, I'm having feelings for this girl.