Lead exposure in last century shrunk IQ scores of half of Americans: study

Re:Lead exposure in last century shrunk IQ scores of half of... by arcticbull on Tuesday March 08, 2022 @11:53AM (#30602163)

That's not actually what the study found.

  Further, cessation of cannabis use did not fully restore neuropsychological functioning *among adolescent-onset cannabis users*.

They did not find a 6-8 point decline for folks who gave up cannabis if they started later in life. In fact they found no decline in IQ whatsoever for folks who started later in life - both when using it and after stopping.

   In contrast, within-person IQ decline was not apparent among adult-onset persistent cannabis users who used cannabis infrequently (median use = 6 d) or frequently (median use = 365 d) in the year before testing.

> There's a lot less known about cannabis at this point, but what we know so far isn't very positive.

... for adolescents. Both your studies only show impact in youth.

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Re:Lead exposure in last century shrunk IQ scores of half of... by legitster on Tuesday March 08, 2022 @12:36PM (#30602822)

I don't think my summary was unfair. I was only asked if there was evidence for persistent effects. There clearly is, even if just for adolescents.

It's also important to point out that for the adult-onset group they only looked at 1 year back. This doesn't preclude the possibility that longer periods as an adult find different results.

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Re:Lead exposure in last century shrunk IQ scores of half of... by mandmandam on Tuesday March 08, 2022 @01:42PM (#30604020)

Sorry, no, your claims and summary were definitively and unquestionably false.

There is a large, large difference between 'Americans' and 'adolescents'. Vast.

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Re:Lead exposure in last century shrunk IQ scores of half of... by mynameisvlad on Tuesday March 08, 2022 @01:28PM (#30603735)

Your summary missed a critical piece, which is that it is just for adolescents.

I don't think, even within the marijuana community, that there is any debate that marijuana use in adolescents is harmful. I regularly see /r/trees comments telling teens to stop until they're at least 18 and their brain finishes developing.

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Re:Lead exposure in last century shrunk IQ scores of half of... by staticassertion on Tuesday March 08, 2022 @12:21PM (#30602589)

Sorry, I took a look at the study and I couldn't tell - what is an adolescent? Like, 10-18? 14-25? I know what the word means, but for a scientific study I assume there's a specific range they're referring to.

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