I've heard tobacconists use that line, i.e., they don't know what they're smelling. Funny thing, ask them to elaborate, and a good percentage of them will just get pissed. They are parroting, with no other frame of reference. I can think of several tobacconists who don't smoke cigars or pipes. Some smoke cigarettes, exclusively.
If a person chooses to experience the prelight aroma of a cigar, more power to them. It's about enjoying the experience, the ritual, etc. Whether or not they can detect properly cured leaf, ammonia, mustiness, etc. is not a prerequisite.