That brown stuff is the tar from the smoke, from the cannabis. It's the same idea with ciggs: That yellowish stuff on the end of the filter is the residue left behind from the smoke. Same with cannabis...it's the residue left behind from the smoke.

I'm not comparing toxins between the two, but it's the same idea.

So I wonder too, why roll an entire joint, to smoke half, then unroll the rest? :wtf:

Whatever floats your boat I suppose.