some environmental stresses really do work the plant senses the stress say frost n the Cannabiss only defense is to produce more tricromes overnight or in a short time they contain chemicals known as cannabinols these "crystals" contain tetrahydrocannabinol (THC) THC is usually found in high percentages 30% in some sativas n 0.2% in some mid-western wild dirt weed ssp there r also other known chemicals witch also add to ur high the tricromes work in overdrive sensing cold danger n genetically potent Cannabis will be more potent