Driving while experiencing the psychoactive and intoxicating effects of cannabis containing THC is extremely dangerous. Do not drive after using cannabis, and ensure you are informed about the driving laws in Ontario. Although the effects of intoxication from cannabis that contains THC may wear off, cannabis stays in your system for some time. It is recommended that individuals who use cannabis refrain from driving (or operating other machinery or mobility devices) for at least six hours after using cannabis. If tested, you could test positive for cannabis content in your body. There are strict penalties for driving and cannabis in Ontario.