I've taken Demerol after a rock climbing incident resulting in a fairly serious (but thankfully transient) soft-tissue lower back injury. I can assure you tha

I've taken Demerol after a rock climbing incident resulting in a fairly serious (but thankfully transient) soft-tissue lower back injury. I can assure you that I was far more mentally impaired on Demerol than I ever have been on pot (which I have used recreationally a few times over the years, but am not a regular user of). When on pot my mind has felt a little "slow", on Demerol my mind was essentially out to lunch for a couple of days.