I've always thought of using cigarette filters inside of joints. Would that work?

I never tried it. I did travel with some hippy
who was convinced that the filters were dangerous, so if I'd try to light up a cig he'd break it, mix the tobacco with some hash and roll a joint :hippy:. I didn't bother arguing with him.

To return to your point: usually a filter is just there so that you have something on your lips that isn't burning weed. I've seen Europeans use tobacco (hand-roll type) for the filter. Some don't even bother with a filter and just throw it away near the end.

The issue with a cigarette filter is tha, though it may filter out some bad stuff, it may also filter out some of the good stuff and it will probably affect the taste. I have no clue how the filters actually work, so I can't say much on this.

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Nice vid.