This article is weak on many levels.

"I learned it from an extraordinary mixture of people I met on my travels." Is this more credible than modern science?

"It is now one hundred years since drugs were first banned" is incorrect. There have been laws in the U.S. against some drugs since the 1860's, and various laws in Europe and the Middle East for a few hundred years.

Even the headline, "The Likely Cause of Addiction Has Been Discovered..." is faulty in that it implies there is only one cause for any addiction.

Even without the causation argument, this article is largely empty of credible science. It's disappointing to see this type of pseudo-science on HN.