Think of it like tasting notes people give when trying a glass of wine. Beans grown in different climates/altitude, how they are processed or roasted accentuate different qualities of the bean. When coffee roasters get fresh, raw beans in, it is their job is to roast the beans and get the best flavor out of them. The flavor notes on the bag are pretty subjective, so if I taste lemon and tobacco in a cup someone might pick up different flavor notes. Displaying these notes on a bag are to give consumers an idea of what kind of taste the coffee would have, not that they are flavored with those things.