could be a few reasons, depending on how it's "thca" you might be missing the entourage effect if it's just thca sprinkled on. dabbing d9 distillate also sucks by itself without terpens and other cannabinoids. it could also be that you're not heating it enough to decarboxylatize it. for thca isolate, this process can take an hour or more, and i'm sure it's the same with normal weed too. i didn't remember why, i think they were making edibles, but people will leave normal weed nuggets in the oven for hours just to accomplish this process.
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