None of them died from smoking marijuana. Hell, the third one it's not even the the dead guy who was smoking, and he was mixing pot with prescription meds.
It's right up there with the most pestiferous alkaloids (in my ancient Manual of Pharmacology.) A drop or two of the pure substance--applied to a mucous membrane--was said (elsewhere) to be fatal to a med. dog sized creature. But the usually quite dilute 'vape'-grade stuff, and via stomach? sounds like a way to go gradually and painfully. aka Dumb.
Jeez ... go out super-calmly: just OD on diacetyl-morphine aka heroin. People won't even do a little chem homework on what to use for your very-last dose of anything. Be lazy/so suffer.