No, there is no obligation on your part to provide a odor-free facility unless such was actually in your membership agreement and/or your marketing material. You are also not responsible for a student's perfume; that student's choice of odors, cosmetics, etc. is not under your control so long as that student is not, in fact, your employee or otherwise actually under your control. If the asthmatic member chooses to leave because of a conflict--personality or scent--with another student, you would not be obligated to return her lifetime membership fee...though it may be the better choice (e.g. better word of mouth; avoid having to defend a lawsuit, which can be expensive even when you win) to offer to return the bulk of said fee, perhaps taking out some reasonable portion for the lessons she has had to date.