Dr.  Anna Schwabe, a cannabis geneticist, reveals why our sense of smell is a very reliable indicator when we’re trying to identify cannabis strains. We discuss cannabis epigenetics, i.e. why genetically identical cannabis plants may produce different levels of THC or CBD, even when they are grown in the same environment. And she gives some expert tips on shopping for cannabis, so you can have more insight into the phenotypes and true THC levels of the strains you’re buying.