uh, you can use anything as a substitute ashtray, really. paper ( just make sure it's really put out but of course make sure no matter what you put the cigarette out on ) uh you could even probably just put it out ontop of the roof. don't just flick it though like some people do. that's how fires and everything start. just smash the tip onto a surface and make sure there's no heat still laying on it. make sure it's completely put out.
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