Won't help you much if you're in a cigar lounge that doesn't have any handy, but you can buy or make your own glue and repair those. Just take some pectin, add water until it's mixed into a glue consistency, you can use a little brush or even a toothpick to glue the wrapper back in place. Give it 24 hours to dry, and you're good to go. Get the smallest jar possible of pectin and it will still last you forever. I usually just make a small batch each time I need it, but you could probably make a little batch and keep it one of those
coke vials with the little spoons for a portable version.