A few years ago I covered as a reception desk at a downtown firm when the regular receptionist was on a break. A courier came in to drop off a parcel. Before he left I took him aside and said, "Your clothes absolutely reek of marijuana." He was astonished - because he couldn't smell it - and horrified. He was also grateful to me for letting him know.  So much for your "sticky" theory. Just like tobacco smokers can't smell the stench of tobacco on their clothes, cannabis smokers can't smell the stench of cannabis on their clothes.