A very interesting topic came up recently in my workplace. The relationship of smoking and sense of smell. The fact is a smoker's sense of smell is very inferior, "broken" or impaired. They don't smell or pick up odors like a non-smoker. So if you want to know "do you smell something in here," don't ask a smoker? Ask somebody whose smell is working properly. A Smoker ASKING another smoker "can you smell anything peculiar in here, I can't" is like "the blind asking the blind "do you see that over that, because I sure don't." The comparison of a smokers' sense of smell to a non-smokers' is like when people who have no animals walk into a house that has a dog, they immediately smell it but the people living there don't notice it at all. Same principle!
A few years ago, I went to list a property for an elderly woman who was also a big smoker. The minute I entered her property, I could smell gas strongly and I told her "you have a gas leak." She couldn't smell a thing. The gas co. came out and told her her the pilot light on her stove (which was so old, you couldn't even order parts for it anymore) and her hotwater heater, both, were leaking, substantially and they turned the gas off completely. They told her they would not turn it back on until these items were replaced. They also said it was a wonder she hadn't blown herself up smoking the way she did, combined with the gas leak.. So having your "sense of smell" is very important. If the house caught on fire (while you and your family were asleep), it could burn down before you even smelled the smoke! So smoking can kill you in a number of ways besides the ones we hear about the most. Having a sense of smell protects us in so many ways.
The National Geographic Smell Survey indicated that, of the people polled, smokers rated the intensity of androstenone, cloves, and gas as weaker than those of nonsmokers, while banana and musk were perceived as stronger by smokers. However, smokers and nonsmokers did not differ in their detection of the rose scent. Additionally, smokers were less confident in their own ability to detect odors. As expected, smokers responses to the survey demonstrated a lowered sensitivity to odor quality. Smokers found the odors rated as unpleasant by nonsmokers to be less offensive, and indicated a decreased appreciation of the pleasant odors, as well. (Gilbert and Wysocki, 1987).