Cannabis is a flowering plant that contains the species, Cannabis sativa, Cannabis indica, and Cannabis ruderalis. It’s popular uses are hemp and Marijuana.
Cannabis (pot) is a single plant genus, but selective breeding and hybridization of the Indica and Sativa species has produced many unique strains. Strains have different amount of specific organic compounds each affecting human physiology differently.
There are no recorded deaths due marijuana overdose, however overdose is theoretically possible at about 40,000 times the amount needed to get high.