No, when he was younger he was pretty conservative. And anyway the memory effects are temporary, you forget while you're stoned, not for the rest of your life.

I smoked a lot of strong weed for decades, then quit around 1990 and when I started again six years later I smoked much, must less. Stoned I aced calculus exams in college; stoned I wrote code at Microsoft. My memory is fine, especially for numbers.

I don't think Biden is in much bad shape. I'd certainly trust his mind more than Trump or Walker.