Back in the day before I quit smoking 16 years ago to appease my betrothed, I used to smoke out of a little home made rig I built out myself. I took a Grabow pipe and reamed the bowl out to the point that a brass pipe bowl and lid would sit flush into the pipe. It allowed me to sit around casually and smoke as if nothing was going on. Provided I was focused on the wind currents I could get very stoned in some rather busy locations. Kind of miss that pipe, but now I am a homebody for the most part and the glass bong and log are my weapons of choice.