Does smoking weed and smoking cigarettes really make you dumb?

No, it doesn't make you dumb but it is often a dumb decision. If you're going to smoke then do it responsibly and don't become a drug addict that creates a life around it.

It won't make you dumb but you're doing a lot of damage to your body. Your body wasn't made to be sucking smoke down into your lungs all the time.
 
It's more that it restricts the blood vessels and deprives you of oxygen
 
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