But then again I'm smokin' on the medical

from Vic Mensa (Ft. Chance The Rapper) – Tweakin Lyrics on Rap Genius

Meaning

Disregard what he’s saying because he’s obviusly influenced by some “legal” substances now the marijuana has been legalized in some areas.

A play on the previous line, because medical symbols have snakes on them since serpents represent knowledge

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