In Episode 9 of the documentary series "Cannabis," directed by Mathieu Kassovitz and Antoine Robin, the team concludes its exploration in Canada. Mathieu Kassovitz visits the official residence of Canadian Prime Minister Justin Trudeau at 24 Sussex Drive. Trudeau, the first G7 head of state to legalize cannabis, shares his vision and motivations behind this decision. He explains that for him, legalization is a way to address many cannabis-related issues, including illegal trafficking and youth protection.

The episode also reviews the impact of legalization in Canada five years after its implementation, assessing the successes and challenges encountered. Kassovitz interviews various members of Canadian society to gain a comprehensive perspective on the effects of this policy. Back in France, Dr. Karila provides information on the signs of cannabis addiction, enriching the debate on the health implications of legalization.