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youre not stuck in a different state of mind and you have not damaged your brain. i've known a few people who only smoked once and felt this way after. things will go back to normal. what you described can be idetntified with some people as a come down. i have known people describe this to me after smoking weed, but not very often and come downs like this are usually from harder drugs. for instance, the days following the drug use may feel dull, less exciting, preffering to be alone, things around you may make you think and wonder, etc. just do your best to keep positive and if you always feel like this after you smoke then you shouldnt be doing it cause its clearly not in your best interest.

I saw a pbs documentary on that. There are receptors in your brain that turn on for that drug. But before you think that's God's way of telling you that pot is good. It actually has a real purpose, so humans won't remember each second of their life. As you can imagine it would be almost impossible to function if we couldn't forget the things that aren't important.

Which should tell you what pot does to the mind.

Your normal functions will come back with time. Smoking again could have consequences that can be regrettable, or even irreversible.