text: Becouse the sounds and the aromas are conected in our hed with some experiance. That is the same thing like some song is reminding you to your firs love or when you feel the taste of vanilla in your hed is going a "film" of your vacation when you eat icecream. If you do this purposely it's OK and you like it, but your brain is working even when you do not like, so he is making this combinations all the time. Hope that I pleased your curiosity.