[doublerabbit]

> while it's not as bad as people dropping cigarette butts on the street (usually literally directly next to a bin!)

People are spitting on the streets here in the UK and it's disgusting.

But I've noticed it on transport here in the UK. They take a puff "cheeky-vape" then exhale it under in to their coat or in to some bag.

[Kinrany]

Could there be a device that would filter the exhaled air?

Make it a part of the e-cigarette, so that one can exhale back into the same thing or into a different port on it.

[cactusplant7374]

There is a filter type device for use indoors but it is standalone.