I always bring my 4 stick leather case with one or two sticks from my humi. When I get to my B&M I go into the humi buy a stick or two and sit down and smoke one that I brought (not bought). When I get home the sticks I bought go straight into my humi to rest (dry up, a bit).
I've been going to my B&M for so many years now, I could probably bring a caddy full of my own and smoke them right there, without a word. I just feel guilty smoking something from home and using there space without a purchase while I'm there. Even if I only buy one cigar, it puts my (self inflicted) "smoking home stogies at the B&M" personal guilt at ease.