There's two parts of addiction, and chemical dependency is only a small part of it, imo. This might resolve that problem, but it doesn't do anything about people who just like to be high all the time. There are lots of people who have addictions to drugs or just activities that don't have any chemical dependency associated with them at all.

Psychology's discovery of the relationship of neurotransmitters to behavior was a huge breakthrough, but trying to treat every problem with drugs is like trying to fix a broken Office install by replacing RAM. Sometimes the problem is software, not hardware.