Turn off leads to points off on perception

Okay, so I've been eyeing this one girl in my Math class since I started school in late September. She reminds me of a midwestern Reese Witherspoon...you know blonde hair, blue eyes, beautiful face, and about the same height as her. You people from the midwest know what I mean. Found out that she was in my other Math class so my chances were getting better to approach her. Well yesterday we finally spoke and found out that she is a Math major. Go figure. There are fine Math majors? Hmm! Today I had my first midterm and as I was walking out of class I saw her light up a cig. That was a big turn off for me. I not saying that people shouldn't smoke, I mean everyone around me (cousins, sister, friends) smokes, so whatever you want to do to your body is up to you. But I guess when her I saw her light up, it just brought her down a few points on the overall perception on her. Damn I thought things were looking up! I have a Probability with her tomorrow afternoon. I'll see how it goes.