How Can I Know If My IQ is Decreasing?
Answered on Quora.
It probably isn’t.
Even very heavy marijuana use in adulthood does not appear to decrease IQ, and I believe IQ may be preserved in heavy alcohol use also and even alcoholism, believe it or not. It’s pretty hard to permanently reduce your IQ.
IQ can go up or down by up to 15 points in adolescence. No one knows why this is. But once you hit adulthood, it’s pretty stable. You can change a lot of things about yourself, but in general, IQ’s not one of them. Be happy with your IQ score. If it’s low, it’s not your fault ...