Photo Credit: Splash

Chief Keef is done being a pot-smoking reckless driver who carries around tons of cash ... at least that's what he says, according to TMZ. He was cruising out of LAX Saturday night - and heading to an undisclosed rehab facility - when he told the camera's about the big life changes he's making. As previously reported ... a judge ordered Chief to rehab after he failed 3 random drug tests while on probation stemming from his speeding case.

So he clearly wants it to be known he's making changes ... but with Keef constantly flaunting his weed habit on social media ... and 3 positive drug tests for marijuana - but the question had to be asked. Peep the video below.