Recent research indicates medication can change one's chemistry, too. Therefore, if a person is on medication it can influence the way a favorite fragrance smells on the skin. Smoking can dull the sense of smell and make us less aware of odors, good or bad. You should make a smell test of a favorite fragrance on the inside of your wrists and then sniff test to see if any of the lifestyle changes described above have influenced the fragrance. Their skin is often dry causing fragrances that are too subtle to evaporate rapidly.
Dramatic orientals are often favorites.
Yes , body heat builds up, fragrance intensifies. Once a bottle of perfume is opened it is meant to be used. Otherwise it will begin to fade with time. Long exposure to strong sunlight or extremes in temperature can disturb the delicate balance of the perfume and change its scent. Perfume, to last, should be kept in a cool, dry place away from direct light.