I think that the X in a way can affect how a girl perceives you. Not HER being on X, but YOU!!! When I meet guys while they're rollin, they always look so happy, nice and fun (of course)
I think that guys on X are more attractive then when they're not on X. But since you asked if the X affects the girl's perception, I'm gonna have to say no. The next day she'll probably think that you're still just as cute (or ugly, depending on her first impression) but emotionally, she might not like you as much as she did the night before. Hope I Helped!!!