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The description of Radagast going crosseyed when smoking Gandalfs pipe (not bong) is accurate, but its more of an OTT reaction than a stoner impression I thought, although I can see why some would choose to take that impression. He does not appear stoned after it, in fact Gandalf suggests it will help to calm him down when he has become agitated. Think of it more like one of the old Hamlet cigar ads.