What if all the doctors who used drugs told us how they did it?

The idea of developing safer modes of ingestion that drug users will use and appreciate for their own benefit seems to have stopped somewhere with crack cocaine pipes, methamphetamine pipes and intravenous syringes. Harm reduction organizations that distribute these items around the world are welcomed by drug users.  Given the health issues that persist for drug users even with brand new clean equipment we have begun to wonder if any funding is being spent on developing new methods of drug delivery? With drug user input?