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Source? Or did you forget?

I'm talking from personal experience. Your ability to keep a train of thought is impaired, you struggle to build the house of cards in-memory to do any kind of extended analysis, the cards you put down simply vanish from memory. You feel empirically dumber.

At its worse, you start to talk about a topic, branch into a subtopic, and are unable to find your way back. You find yourself asking people "what was I talking about?" all of the time, imagine doing this in the middle of a presentation or while talking to a client.

Relevant Study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3931635/

You mean, while you're actually intoxicated? No kidding!

Or do you mean while NOT impaired, as a result of regular "after-hours" use?

Not only while medicated. The memory issue is cumulative, it is slow onset and stays with you until at least 3 months after complete abstinence.

I find I am just like this if I'm sleep deprived. In general my memory is incredible, but I occasionally have terrible recall outside of my current train of thought. I used marijuana quite heavily for some periods of time in high school and college and it did have some effect, but not as great an effect as sleep-deprivation. For me, the two are correlated.

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