That's absolutely true, but it may have been truer 25 years ago, because there were far fewer drugs, and the drugs on the market were good quality. It's sad but true.
Today, there are more drugs, more kinds of drugs and contaminated drugs. Young people also mix substances. I don't know a lot of addicts who use only one drug. What I'm seeing is people who are addicted to multiple drugs.
As I said, harm reduction is a tool, but it's not a panacea. We have to tackle the root of the problem and treat comorbidities.