But when i have visitors over for a birthday or a party. I always put a some empty soda/beer cans outside where they can put there ash or extinguish there cigarette in. Not very style full but it works.
So to make it little bit style full i made this can "adapter". Only thing you have to do is remove the top off the can, Fill the can with 1/3 off water, and you have your self a ashtray.