The term “cannabis” generally refers to the cannabis sativa plant. It can also refer to products derived from the plant.
The term “marijuana” usually refers to parts of the plant (such as dried leaves, flowers, stems, and seeds) that contain substantial amounts of tetrahydrocannabinol (THC).
THC is the psychoactive compound in marijuana that has effects on a person’s mental state when it is used.
Because of its psychoactive effects and the potential for impairment, the THC found in marijuana is the primary concern for driving safety.