Brazilian hospitals don't just come up with giant, friendly nutsack mascots - they have good ideas too. One of which has been to pair with Warner Bros. to make kids with cancer think their chemotherapy drugs are a superhero formula. Branding the IV bags with the Bat-symbol, S-shield, Green Lantern and Wonder Wings, they also hand out special comics in which the heroes themselves face cancer-like symptoms, take a formula from a similar bag, and regain their powers. It's a bit like how I learned to eat spinach because it made Popeye stronger, but with larger stakes. Probably more nausea, too.
If you tried this on adults, I think they'd say, "Nah, just gimme a weed card."