This I can do.Sometimes the options seem limited to being menacing or walking away. However, depending on the person/people and the situation, don't overlook the possibility of doing a little public relations for pipe smoking. If you can be warm and pleasant, make conversation off the subject, assure them that pipe smoking is just an occasional pleasure for you (fib as necessary), and lay a little charm into it, you may leave an impression. This may only make some more hostile, in which case, back to options one and two. But if you can present pipe smoking as something done by sociable pleasant people who are good conversationalists, who knows? They may have the check-out person at Walgreens slip a cob and a pouch in the bag with their aspirin and Tums.
CW
Posted from my Raspberry Pi 3 running Raspian