The Afghanistan Papers: A Secret History of the War is a summary of the Washington Post's reporting on Afghanistan, specifically on the US government's own internal assessments from all levels of the military and political administration. In it, you'll find this quote:

Of all the failures in Afghanistan, the war on opium ranked among the most feckless. During two decades, the United States spent more than $9 billion on a dizzying array of programs to deter Afghanistan from supplying the world with heroin. None of the measures worked. In many cases, they made things worse.

The US doesn't need "tankies" or anyone else to make themselves look bad as far as the Afghan drug trade goes.