After reading the letter from Mr. Dufresne ("Light up indoors, Sept. 14), I feel compelled to respond. Please, please rethink this suggestion. With the outside air unbreathable, you are asking to be allowed to make the inside air in all public places equally unbreathable. For years and years, I wasn't able to dine in a restaurant, enjoy a movie in a theater, listen to music in any venue, because of the cigarette smoke allowed. Anyone who knows me will understand how hard it was for me to give up 'going out dancing'. I simply couldn't breathe.