Earlier quoted context omitted.
You can drink two glasses of red wine every day of your life and if you are healthy adult male of average weight, this will likely extend your life and improve your health. For a woman it is down to one glass. You can drink a glass of coffee or a cup of tea every day of your life and this will also probably improve your life and your health. Trying doing that with cocaine or heroin. Actually do not try it because you…
One of the 4 founders of Johns Hopkins Hospital was addicted to both cocaine and morphine and was able to remain functional while addicted for the rest of his life. I think it's easy to mix up the effects of the illegality of certain drugs with the effects of the drugs themselves. Impurities and poor injection hygiene are probably a large part of the health effects of these two drugs currently, and they are a result…
I know there's more to your argument than "Halsted did it so it must be ok", but I think this is a useful point.
[1]: http://www.nytimes.com/2010/04/27/health/27zuger.html?_r=0