Could you forget how to ride a bicycle? That feeling of forward motion, untethered to a parent steadying the seat, stays with most people into adulthood. Hence the expression: You never forget how. But imagine for a minute that you did have to forget. Could you unlearn something like that? That’s what addiction is like, except instead of trying to unlearn something that is fun and mostly free of consequence, you’re trying to unlearn something that has the power to take over your life. Or to kill you. Dr.