The bigger point is simple
Upon administration, THC undergoes extensive first-pass metabolism, particularly when ingested orally, which significantly reduces its bioavailability (~4-12%) compared with inhalation (10-35%) (40)
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After smoking, the lungs naturally undergo a self-cleaning process to eliminate toxins and mucus
In contrast to a completely open MRI machine it still has a tunnel the patient must pass through, but the opening (or bore) is wider and much shorter
Szczepaniak-Gillece notes in the article Smoke and Mirrors: Cigarettes, Cinephilia, and Reverie in the American Movie Theater, theater smoking lounges were often outfitted with asbestos cement mixtures or fire-resistant paneling