Wednesday, April 13, 2022 at 9 p.m. and Sunday, April 17 at 2 p.m. on KPBS TV / On demand with the PBS Video App. NOVA explores our relationship with cannabis, uncovering what scientists have discovered about the plant’s effects on the body and brain, including its potential risks and medicinal benefits, and the demonization and criminalization that has disproportionately harmed communities of color.