Michael Delong said this quote

The path to a sustained victory in Afghanistan lies in improving their economy, creating jobs for the Afghanis, strengthening their government and national services, getting the provinces to trust each other and work together, and eliminating the opium trade. Previously, the United States' policy was to not get deeply involved in internal Afghani drug issues; now we've changed the policy and are actively working to eradicate the drugs. But nobody has yet to come up with a way to shut down the poppy fields and get the Afghani people back to work. Until that happens, the Taliban will inevitable creep back in.