THC doesn’t vanish a few hours after use. Because it’s fat-soluble, it lingers in your body’s tissues—especially fatty deposits and organs—long after the high ends. As you inhale or ingest cannabis, THC races into your bloodstream and finds a spot to settle. From there, it’s released slowly back into circulation over days or even weeks, keeping its effects on inflammation and immune function alive. Today’s concentrates push THC levels past 80 percent, and many users consume daily or multiple times a day. That constant input means your tissues stay loaded. Researchers are now seeing that buildup can tweak how your immune cells respond. Early studies hint at shifts in cytokine production, altered white-blood-cell activity and mild chronic inflammation—changes you wouldn’t spot if you only looked for an immediate high. We still don’t know all the long-term health outcomes, but signs point to more than just lingering psychoactivity. Animal experiments link sustained THC exposure to reduced resistance against certain infections. In humans, heavy consumers sometimes show blunted vaccine responses and shifts in gut-immune interactions. As potency and frequency climb, scientists warn these immune changes deserve close attention.