Get "Randy's Wired Papers". They have a thin wire attached to the paper. Makes rolling a snap, and then functions as a roach clip as you smoke it down to the very end.

We used to use a smoking stone (probably another name for it). It was a thin flat stone with a small hole in one side and a bigger hole in the other. The joint went in the big hole and you inhaled it thru the small hole. Your lips never touch the joint.

Then again, you can always use a roach clip.