Flashbacks?

I am curious about lsd flashbacks. I've hear many different info on how long afterwords. I mean can you catch them years after? What is it like? Can you still function? Does it come on gradualy? What approaching if your driving? Can you pull over to the side? How frequent is it?

Answer:
Hi. I be a passenger in a coup¨¦ driven by a friend who experienced a flashback months after his 'experiment'. We were on a highway and it be all he could do to hang on to control of the car. He did not bring up to date me why he stopped so abruptly (I would own steered the car) because he could not speak. 'Nuff said?
I think they are a myth. I never hear a first-person account of one.
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