When I smoked I used a small “pocket can” that was shaped like a trash can to hold my butts until I came back around to a proper garbage can. I then switched to non-filters and, even though they lack the cellulose filter, I still used the can.
I hate seeing cigarette butts everywhere. It might be because my first job in high school was sweeping the parking lot.
I would pick them up these days, but in my part of the country it’s almost dangerous to touch anything from a stranger that could be personal use. Rampant IV drug abuse and exploding hepatitis cases.
It might be paranoia, but I don’t touch anything that could be personal use.