That's a tough position. I wouldn't have anywhere to dump it. I would probably just put my palm over it. I just had this sort of thing happen at a local cigarette store. I was buying some codger blend to remind them that we exist, but apparently they are no smoking now. I was asked to put my pipe out, palmed it for a second and tossed it in my pocket. Note there were no new signs saying that I couldn't smoke. He was annoyed with me and took me to the counter to get what I wanted. I don't mind skipping lines but this seemed unnecessary to the poor folks in front of me.