First off, before we go into why smelling your weed is important, we must first touch on one class of phytochemical molecules found in cannabis plants known as terpenes. Terpenes simply put are aromatic molecules found in cannabis plants that give different strains of cannabis buds their characteristic scent. Examples of terpenes found in cannabis plants include limonene, myrcene, linalool, caryophyllene, terpineol.