Hello Step 1: Try to think what makes you remain the slave of a substance like codeine. You cannot sleep without it? Or you start feeling miserable when you dont take it. Step 2: Try going codeine free from fews hours from the regular time and check for withdrawal symptoms. Step 3: once you understood these two things, you should learn to manage withdrawal symptoms while controlling the urge to use the substance. Step 4: Engage your self in some more meaningful activity like walks or sports or swimming whenever you have the urge, I mean replace one urge with another. Not escapism but will power ! Try It works every time if done systematically !!