And here you are again telling that same bald faced lie. American involvement in hard drugs was insignificant until the Civil war when massive numbers of soldiers were exposed to these substances to relieve the pain of their battle injuries.
Subsequent drug activity became a continuously growing problem until the early part of the 20th Century when we deliberately banned these substances and thus avoided the utter societal collapse which destroyed China.
That you keep SAYING there were minor problems is evidence of a deliberate attempt to deceive people who have not studied this period of history. You are wrong. You have an agenda, and you cannot be trusted to tell the truth because the truth does not conform to what you want.
If the problems were minor, then why did we ban these substances? Even the agreed upon facts dispute your account of the events. 
1900 - Opium, morphine and cocaine in many patent medicines leads to addiction and death. Mrs. Winslow’s Soothing Syrup kills many children each year due to overdosing on morphine. Morphine is the syrup’s primary ingredient but it is not listed on the label.
http://www.goodmedicinebadbehavior.org/explore/history_of_prescription_drugs.html