I am not sure that the 1.3% is a good number. I think it does not reflect actual usage rates for opium. One of the alarming trends is the abuse increases in medical opiates (opiate or derivative based prescription drugs).
The number of past year heroin users increased between 2007 (373,000) and 2012 (669,000).
So assuming that our population has not essentially doubled from 2007 to 2012, herion usage is on the rise, and 1.3% can not be correct.
If you want to look at just Heroin, see figure 2.4 on page 17. Since 2002 (10 years) Heroin use (past month) has doubled, 166,000 to 335,000 for ages 12 and up.
Now you need to add in non-medical use of prescription drugs (opiates), and that adds another 2.6% (see figure 2.1, page 14) of total population, and is rising. This rise is primarily attributed to ease of access. Non-medical use is also the top mixer choice for pot users.
In 2012, the illicit drug categories with the largest number of past year initiates were
marijuana use (2.4 million) and nonmedical use of pain relievers (1.9 million). These
estimates were similar to the numbers in 2011. However, the number of marijuana initiates
increased between 2007 (2.1 million) and 2012 (2.4 million).
http://www.samhsa.gov/data/NSDUH/2012Su ... Index.aspx
These quotes are from the 2012 National Findings front matter summary.
It is easy to focus on herion needle addicts, but opiate abuse is a much broader problem. Part of the misinformation campaign by the pro-drug crowd is to obfuscate and isolate abuse issues into unrelated independence. This way they can try to argue that it is a small problem and no worries, nothing has changed...
Well, I disagree. And so do the dead bodies that are piling up. You know, the ones that Simon claims don't exist.

The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)