[mugs99]

If rhubarb is poisonous, then it also demonstrates that Supernatural is wrong when he states, "plants work as well as the extract".

Potato plants are poisonous too. Do you enjoy french fries or do you consume potato extract? Marijuana is 100% non poisonous. Supernatural is right.
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[robertpaulsen]

"Marijuana is 100% non poisonous. Supernatural is right."

If he said that he would be.

But he was 100% wrong when he said a) marijuana is harmless and b) "plants (in general) work as well as the extract".