Terpenes are the aromatic compounds that give cannabis strains their unique scent. In other words, terpenes are the reason Tangie smells like sweet oranges, Permafrost like a pine forest, and Sour Diesel like a bucket of funky fuel. Research has yet to demonstrate just how these aromatic compounds contribute to the effects of cannabis, but theoretically, different terpenes may help shape the sensations imparted by different varieties of cannabis. Just as different essential oils have different uses, so might cannabis terpenes.