> Only responsible and healthy individuals should self-use drugs, generally speaking.
This not a very helpful observation, as we all know that this is far from what happens and is not going to become the norm.
Furthermore, quite a lot of people became addicted to opiates through acting seemingly responsibly (at least initially taking the drugs under the supervision of a doctor whom they could reasonably assume was looking out for their best interests) and in the persuit of better health.
I should add that Hart himself punted on this issue when the interviewer touched on it. In the interview, he does this a lot - for example, when the interviewer raised the question of physical addiction, Hart merely discussed the physiological basis, without touching the obvious issues it raises for the concept of responsible use. It may be telling that, in his description of himself as a responsible user, he avoided saying anything about this particular issue.
> Then you can also argue that you might not have lost your friends only because of Heroin the substance, but also how people with heroin addiction is "treated" and frowned upon in society.
This is also rather beside the point, as, while the way addiction is treated is also a problem, it is not an issue except where there is already a problem with addiction.
That aside, there is such a thing as responsible addictive-drug use (including, but not necessarily limited to, people with chronic pain that only responds to such drugs) and the way we respond to addiction today is in many ways ineffective and in some ways very harmful. One cannot make a very good argument for reform, however, on the basis that some people can use some of these drugs responsibly.