I have a few that you can tell are not going to buy but want so badly to pick them up and smell, but you can just tell that guilt they feel for not buying. After selling for as long as we have you recognize it. When I see it, I try to alleviate their guilt and let them know it's okay to just sniff and browse by picking them up and handling them.
I get quite a few that just want to sniff. A large percentage end up buying a bar. I just tell them sniffing is free. Enjoy it.