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[F L E S H]

This is from Drug War Crimes: The Consequences of Prohibition

I am pretty sure the author means that 19% of the 35% that tried it became addicted. Since I don't know the exact numbers lets say there were 10,000 soldiers and 35% of them tried herion. Thus 3,500 of them tried heroin, and of that 19% got addicted or 665 of the 10,000. Check my math if you want:
10000 * .35 = 3500
3500 * .19 = 665

I'm not doubting your math, I'm just pointing out that those stats can be interpreted in two very different ways, and depending which way the author means makes a big difference.

The other way of looking at it is
10,000 * .19 = 1,900

That's three times more than 665. I wonder how the author meant it, seriously...