Those people who are dependent on substances or activities that are negative for their well being require assistance whether they wish to be honest or not. Most people who are hooked on unsafe substances or activities simply affiliate themselves with people that have those identical issues, that makes it hard to attempt to advise these people in a helpful way.
The best advice that can be provided to an addict is advice which comes from goodwill. Advise addicts that you may worry about there are physicians who can assist them. Additionally, advising addicts to get aid from groups like Alcoholics Anonymous or Narcotics Anonymous is yet another great way to offer those people hope.