IMO the creep effect has to do with the way the cannabis is cured. If it is cured with heat, it gets some of it decarboxylated and it changes the ratio of THC-COOH to THC. If from what I have read is true, that effects CBD and CBN ratios too. If it is just cured in ambient conditions, then most of it stays THC-COOH. I think the heat treated stuff has a creeper effect. I smoke a little of my larf buds that I dried out in the toaster-oven and it doesn't hit me too quick. I hit the buds that I dry in my closet, cure in jars and the effects hit instantly, but the high doesn't seem to last as long, or I just like smoking the slow dried stuff more.