how do you stop using crystal meth and never go back to it?

I've been using crystal meth for 8 years and ive been in 8 rehabs i go to meetings and have a sponsor.But in the back of my mind i still want to use .I want to stop for good any suggesstions

: http://alcoholdrugstreatment.info/how-do-you-stop-using-crystal-meth-and-never-go-back-to-it