Burning stuff stored in fat is one way to get toxic levels of stuff into your bloodstream, but I can’t imagine it’s the only way. It would just be hard to get sick off pot through normal use and not realize it.
I think you could get into a bad cycle with this if you didn’t have the information about what was causing it. Nausea makes you not want to eat, which makes your body burn fat. Not wanting to eat but knowing you have to might cause you to smoke more to treat the nausea. Nausea gets worse making it harder to eat, etc.
You know they had to add the $200 fine afterwards because the instant death part wasn’t enough of a deterrent for some people.