Katt Williams -- Nick Diaz Suspension Is A Joke ... It's Just Weed, Man

Suspended UFC star Nick Diaz just found his first celeb defender ... and maybe someone to smoke with ... 'cause Katt Williams is coming out strong for weed-blazing athletes saying it's not fair to ban them for toking up.

As we previously reported ... the Nevada Athletic Commission slapped Diaz with a 5-year suspension after he tested positive for pot after UFC 183.

We got Katt out at LAX and he told us the suspension is TOTAL BS ... saying that the hammer should only fall on athletes that enhance performance ... not junk food consumption.