Im prescribed adderall for ADHD. It is a high. You feel more positive, more productive, more forward looking for a few hours and its back to baseline or worse when you crash.

As for impairment, it really depends. If weed removes your anxiety and lets you relax, its benefit could be greater for what youre doing than the impairment it causes. And adderall, SSRIs can cause impairment of sorts too.