Did you read the article? The percentage of people who become addicts after using drugs is actually quite low, even for the 'big four' most addictive drugs (cocaine, heroin, meth, and crack)... so it is NOT true that everyone's free agency is overruled by addiction. In fact, a significant majority do not lose free agency; should they all be restricted because some people can't handle it?
The harmful products we should regulate are ones whose use harms other people; things like pesticides, pollutants, etc. Otherwise, where do you draw the line? Lots of people think playing video games or watching tv 'rots your brain.' Some people eat way too much unhealthy food. Should we ban tvs and Doritos?