[Rduke55]

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When I am on acid the world smells a certain way. Never smelled that smell any other time. And I was sitting in my living room so its not like i went around something new. Now I occaisonnally become aware of th smell at random places.
My boy has flashbacks to a trip that was way too intense for him (he lost his sense of ego or self whichever you want to call it) when he does nitrous. That's always funny.

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So you associate a certain smell with a trip. Or you associate some other cue with this smell and perceive it (perhaps inappropriately). How is that damage? People that have never done drugs before have similar experiences.
And in your second example, he's doing nitrous for christ's sake!