http://www.businessinsider.com/sinaloa-jalisco-cartels-fighting-control-us-heroin-supply-2016-9

The Heroin habit growing in the U.S

Here in the bay area its always been black tar since the forties, my uncle was a dope fiend and i asked him if the china white was better then black tar and he laughed he said the tar was way better, a junkie would know right, he started slamming when he was 14 and hes 66 now