It seems like there is some scientific reason for it. I forget what it would be though. It was some magazine article I think. It could just be extra resin itself. Somebody will know, I bet, heh.
True though, some are like silk, but will tear you up and put you in a fetal position and others will send you choking and coughing from the very first hit… I had one strain I grew like that. Man, would it expand. It was in a complete different world than anything else I had, or still have.