While we are on the topic, you may or may not be shocked (I wasn't) regarding how many serial killers were big marijuana puffers. Psychotic murderers sure do love themselves some weed. Who knows if they were already sick, or if the pot made them that way? Here's a few.
Columbine? Yup. Big doobie smokers.
Batman theater massacre? Yup. Big pot smoker.
John Wayne Gacy? Loved the weed.
I don't think "poison" is the mot juste there ... but, yes, pot edibles caused those deaths - with a helping hand from the users being too foolish to find out a safe dosage - indicating that pot edibles need better regulation. Preventing these several deaths was certainly not worth the costs, monetary and other, of marijuana criminalization.
Psychotic murderers sure do love themselves some weed. Who knows if they were already sick, or if the pot made them that way?
Since very few pot users become psychotic murderers, it seems unlikely at best that "the pot made them that way."
Jared Loughner, as well.