I cannot stand that my girlfriend smokes. Please tell me if I'm just worrying for nothing

I (21M) have been with my girlfriend (20F) for 6 months now. We're soulmates and best friends. I love her so much and I couldn't imagine living a life without her. We're in college and some of her smoking habits scare me. I also have really bad anxiety that might tend to make me worry more than I should and I think I need to know if we're going to be alright. She used to vape a lot but she's been clean for 4 months after she says I influenced her to stop. She occasionally smokes a few cigarettes on weekends and occasionally smokes weed (usually through a THC cart). We both drink on occasion too but I don't smoke. I know it's college and people experiment but I cannot stand that she smokes because it makes me worried about her health in the future. I have a feeling she'll start to cut back on the smoking once we graduate and may even give it up entirely but I worry she won't or I worry that the damage will already be done. What do you guys think? Sorry if this sounds like a stupid post but I have terrible anxiety that makes me worry about this.