>The Organization of American States estimated that the revenue for cocaine sales in the U.S. was $34 billion in 2013. The Office of National Drug Control Policy estimates that $100 billion worth of illegal drugs were sold in the U.S. in 2013
$34b refers to cocaine; $100b refers to everything.
It's not an unreasonable guess.
The numbers are hard to get right. Here's something about different statistical methods that end up with very different numbers (about 650,000 people who used heroin in a year vs about 1.5 million people; about 60,000 people who use heroin nearly daily vs neary a million people who used heroin nearly daily.)
You'd sort of expect the total value of illegal drugs sold in the US to be greater than the total value of cocaine sold in the US, since there are other illegal drugs besides cocaine.
So that's $350 per capita on average. That's a lot higher that I expected.