Many times I have walked up to people (including Qatari men) pointed to the no smoking signs above their heads and told them in no uncertain terms to put their cigarettes out.    Usually they are very embarrassed and do so.  Several young men even apologized to me.   I praised them for their manners.  When some kids at Villagio blatantly ignored me,  I let them have it with both barrels.   People all over the food court turned to look.   They did not put their cigarettes out, but left the area and I hope will think twice before lighting up in public again.     If we keep turning a blind eye  nothing will change in my opinion.    I don't want to breathe their fumes.   In fact,  I refuse.  They are the ones in the wrong and I don't mind telling them so.