Because Doctors screwed me over and gave me horrible advice I had to learn how to fix myself.  I learned this from rinsing my nose but it works with weed and blends too!  Simply hold your nose closed while inhaling (e.g.) weed, holding it in, and moving your head up and down, tilt it left to right, and slowly exhale through your nose while moving your head back and forth and left and right. This exposes the goodies to your upper sinuses which I know better than anyone is connected to your brain. I find I get 50% more benefit from a hit of weed smoking it this way! This could make your stash last twice as long.