Not that I know of, but since the United States is the world's biggest drug trafficker, I wouldn't doubt it. There sure is an abundance of photos with GIs guarding opium poppies. And then since the American occupation, unlike what the situation was under the Taliban, Afghan opium has experienced a resurgence. Put that together and answer this: Qui Bono?
I know a fellow that flew for Air America (aka the CIA) during the Vietnam Conflict and they were moving drugs then, too.