Ever cheaper drugs such as crack, krokodil and various other new products mostly get shipped out by the silk road II and are initially legal. The high is generally tweaked to be bigger and longer lasting. Smuggling gets ever more sophisticated so more drugs get in. I have a simple question about this: How quickly is the addictive personality being selected out of the population? In 1900 NYC had a higher proportion of drug addicts than in 1968, 1968 saw a higher proportion of junkies than we are seeing now and this kind of selection should be measurable. The question therefore is how fast death/sterility due to shared needles/unprotected sex is taking addictive personality out of the gene pool?