Can i smoke marijuana while on flovent hfa inhaler for asthma attacks???

No, you cannot -- or at least should not. A single or occasional use probably won't hurt much. However, no person with asthma should smoke anything. Marijuana is just as dangerous as tobacco. Do your best to stop marujana; if you continue, you are risking serious health problems including early death. (Yes, it really is that serious -- someday if not immediately.) Good luck.