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Confused 2nd timer - does heat break down THC?
(kbin.social)
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I don't think the preroll decarbed in your car. What's more likely is that it was type 3 or type 2 flower, maybe even sugar leaf, and you didn't get high from it.
If it still smelled and tasted like herb when you smoked it then the terpenes weren't cooked off which means any cannabinoids were still present.