I was into incense burning in my young days, however i do not bother now, i loved anything with a musk fragrance, still do, but i had heard it is bad for your lungs, probably not like cigarette smoking, but still maybe there is something in it who know's but i imagine hair spray, air freshners which i use are also not good for the old lungs either, our world is so full of pollutents that we use in our everyday life isn't it?