Well, it would be second hand crack vapor, which I really doubt would have any effect on others at all. Cocaine in small receational doses really isn't that harmful to begin with, let alone second hand microdoses. And what if I don't want your second hand gasoline fumes? I don't want or own a car, why should you get to drive one around in public? I absolutely guarantee you that your exhaust fumes are worse for my health than my second hand crack vapor is for your health.