What shell I do with heavy drug users?

It is very hard to change a heavy drug abuser to stop using drugs. It is quite hard to make a person who doesn't even acknowledge their drug usage to change their mind. I think that one important thing for this is that we should make the drug abuser to relize how bad he or she is effecting the community and First, I would show him some videos or documents TV programs to show and make him or her to relize how harsh and dangerous the drugs are. Then, I will show the background of the usage of drugs. Then approach them very softly by asking gerneral questions. If you show them that you understand their feelings, they might open their mind and ask you for help.