No, Kizer has repeatedly argued that pot my have PED-like advantages during a fight. He's talked about the pain-lessening potential and that being an unfair advantage.
Here's one example (NSAC’s Keith Kizer: Marijuana has possible performance enhancing aspects to it | The MMA Blog | Blogs | theScore.com
“Well, it’s a prohibited substance,” Kizer told Ranallo when asked why marijuana is on the banned substance list. “Why is twofold. One is possible damage to the athlete taking it, and two, there’s possibly performance enhancing aspects to it. WADA doesn’t just put any wily-nily thing on their prohibited substance list.”
"If it was old school MMA I would just take @bisping down and lay on him til he died of starvation."