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A person who abstains from consuming marijuana.
"Some of the sportier frat boys and your average jocks are treetotalers, that is they are comfortable with corroding their livers binge drinking, but when someone offers to smoke them out, they react as if asked to sign their souls over to the devil."

Treetotalers may abstain for a number of reasons. Epilepsy, other psychoactive conditions or general Straightedge cultural adherence are two common conditions.
by Pabblow November 23, 2010
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