Have you ever smelled something that evoked a really vivid memory? Where every detail of a past experience was suddenly brought to the foreground in your memory? Maybe a certain kind of perfume reminds you of a past girlfriend or something like that.<p>In my experience, that&#x27;s what people are talking about when they talk about &quot;acid flashbacks&quot;. It&#x27;s just that you tend to form very strong memories while tripping. It&#x27;s not dangerous and it&#x27;s not something unique to psychedelics.