@Caitlin260 It's hard enough to claim for any kind of compensation when guests smoke indoors. The odds of getting anything out of Airbnb if guests only smoke outdoors are basically zero, and there's no such thing as a "rule violation charge."
You're entitled to your rules, so if it's important to you that people don't smoke on the grounds of your property, you may contact your guests to ask that they walk across the street whenever they want a cigarette. What will that accomplish? Well, maybe the discarded butts will be slightly farther from your doorstep. That communication will be the thing the guests remember most about their experience, and when it comes time to leave a review, they'll find nothing but faults. Five stars? Forget about it. I'm not saying you always need to feel held hostage by fear of bad reviews, but the fact that your listing only has 1 review so far means you don't exactly have a firewall. You have to ask yourself if this is the hill you want to die on.
Catering exclusively to non-smokers isn't a realistic option, so no matter what your rules are, dealing with your guests' residual smelliness is going to be a part of your normal cleaning tasks sometimes. You might be able to reduce the litter somewhat by designating an outdoor smoking area with an ashtray, but if that's completely out of the question for you, I'm not sure short-term rentals are going to be in your comfort zone.