I'm old we never used filters back in the day, sometimes we'd use what we called a crutch which was just a piece of whatever thin cardboard we could find rolled into a cylinder.
I actually enjoy the russian roulette element of having to find out the hard way when it stop burning flower and starts burning crutch. It's like a hard "joint's done" notification.
My buddy and I used to keep several generations of roaches going at once. So once you have enough roaches, you roll all those into a joint to create a "second generation joint". Then once you have enough 2nd generations you can make 3rd, and eventually 4th, and at that point those will just knock you on your ass
one time I smoked a roach from a backwood blunt in the bong and immediately passed out on the floor. Woke up with the stereotypical circle of faces staring down at me (I was only out for a few seconds)
Generally crutch or filter is the name for the cardboard around here and then the roach is what's leftover at the end whether it's got a crutch or not.
I like no crutches but I usually smoke a joint then shove the roach into a bowl and finish it off.
Or save it for later but then you've gotta carry around the stinking stub of a joint.
Yeah just some rolled up cardboard to keep the bits of weed from getting in your mouth, usually from the rolling paper package or a pack of darts (Canadian for "cigarettes") or whatever