Looks like some here have the idea.
The US gov imports opium, heroin and coke to fund black ops. They then declare drug users to be a scourge so therefore enacting a control on them. Problem, reaction, solution.
So actually instead of funding retail terrorism (Al Qaeda, IRA) illegal drugs wind up funding wholesale terrorism (US gov, CIA, DHS, Mossad). When large busts are seen, it's usually the initial agencies clamping down on the competition or offering up token busts to seem as they are combating the drug traffickers.
Most ecstasy in the US is run in by Israeli and Russian mafias so that funding goes to Zionists (not a racist comment here, just stating a fact) and Mossad .
Marijuana comes into the US from all over but mainly South American cartels. They don't engage in terrorist activity in the US but they sure aren't nice guys to folks in their own country.
Technically that claim of drugs funding terrorism is correct. However, the devil is in the details.
Like was mentioned above, you give more funding to terrorists by buying gas and paying your income tax.