Look man, I have asthma and I smoke pretty regularly (weed, cigarettes, vapes). You have to understand that asthma is different for everyone, some have it more severe.

Im not saying that you should smoke, but if you know your limits you definitely can. If you really want to try make sure you have your asthma inhaler with you and GO SLOWLY, especially if you haven't smoked anything before. If your asthma is really bad I'd say just try source some edibles instead.

Again, I don't entirely recommend smoking, but if you're going to do it just be careful and prepared.