Once again it's not black and white. Use can can become worse leading down even worse paths especially if there are additional issues to deal with. Poor use can create these additional problems whether they be mental or physical. That one page is meant to help alleviate that so that seeking help and/or quiting is more likely. Also, heroine addicts aren't a closed system, they affect themselves and those around them. You might not even be able to tell if someone is one just by looking at them. They could be cooking your food, teaching our children, cleaning your teeth, having sex with you... Unless of course you watch too much TV and think they just crash out in drug houses and in hallways of run down apartment buildings...