Being involved in the drug trade in any country is dangerous business. The taliban definitely still are involved in the heroin trade but they have given many poppy farmers a certain time frame to stop cultivation and transition to something more productive for society. You have to remember the only reason they were involved in the drug trade in the first place was to fund their insurgency. Also the drug lords in Afghanistan aren't "taliban" per se but rather powerful drug lords who side with the taliban because it benefits them.