my opinion
a friend of mine smoked alot .. i mean on a day about 5 to 10 joints. in these years he changed alot ... i am not sure if it damaged his brain but he was a diffrent person , he was alot more slow on all things, also thinking ... so maybe you call this getting dumb from it.
he stopped a few months ago because he needs his brain to learn , he feels better, works better and he is happier now ... he learned his lesson
all things you do too much are bad ... like
everything is poisoness it depends only on the quantum
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For every human problem, there is a neat, simple solution; and it is always wrong.
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