I'm going to save you some time and frustration and just let you know: You're being down voted because you seem to be treating drug addiction like a personal failing rather than the disease that it is.
Knowing the thing you are addicted to could kill you is not a significant deterrence when you are addicted to something like heroin. You just feel terrified and also addicted. Clearly you don't understand addiction, and shouldn't be passing judgement on to others.