How much weed can you smoke before getting behind the wheel?

Taking one toke of a joint is enough to lead to a traffic fine under rules rolled out ahead of the legalization of cannabis in Canada next year.
Drivers who smoke weed and don’t want to get caught legally impaired would need to wait at least several hours before getting behind the wheel, said Doug Beirness, senior research associate at the Canadian Centre on Substance Use and Addiction (CCSA).
“There really is no amount of cannabis you can smoke and stay under a level of tw