Put a gun to the persons head (or because the self preservation instinct in them might not be strong in them, a loved one), say "Don't smoke or I pull the trigg

Put a gun to the persons head (or because the self preservation instinct in them might not be strong in them, a loved one), say "Don't smoke or I pull the trigger". Magically addicts regain the ability to choose. Addiction might make it uncomfortable if you choose to stop using a substance but it doesn't use the substance for you. All action excepting reflexes are a choice.