Being addicted to substance is not a jokeing matter. When one is addicted to substances, (take for example codeine with ephedrine, ) after sometime the person can not function Without the substance. The chemistry in the brain has been change. Accustomed to the substance or the brain system has got hook to the chemistry changes after the chemical has been consusm, the person will then con't the drug habit . Without it the person cannot function.(lost of motivation, depression ++) . Even stopping it for a long period, the addict's mind cannot be the same as before when the person's mind had gotten used to the drug he or she had taken before he or she was addicted and has to take them just to feel Normal. Scary ya.....ending up with psy Med.........psychology Illnesses.