Chad Johnson was straight fire during a lecture at the University of Florida Thursday morning -- blazing up a cigar in the middle of class ... despite the fact it's a non-smoking campus!!
The ex-NFL star was the guest speaker at a sports media class on the UF campus -- and cracked jokes about all sorts of stuff ... including his ever-changing last name.
@ProfSpiker hitting us with one more surprise speaker. @ochocinco ud83dudc4fud83cudffb #sportsmediauf pic.twitter.com/7aILQM1faP
— Daniela Hurtado (@DaniCHurtado_) December 1, 2016
But Chad got the most laughs when he pulled out his stogie -- and actually began to smoke it during the class!