Whether it is the fact that this misguided and evil policy has its historic roots in racial discrimination*, its modern roots in the cynical politics of the Nixon Administration**, has had the effects of turning the United States into the world's largest prison camp***, causing the corruption of law enforcement through unconstitutional forfeiture laws or perhaps most importantly, creating the belief among many Americans that the police and our government are the enemy, the bottom line is that this is an incredibly dangerous policy to have while we are trying to defend the nation against terrorism.
Furthermore, the "War on Drugs" is a failed policy, it has not worked in the past, is not currently working, and will never be successful. We need only look to the nation's ill-fated experiment with Prohibition for proof of this policy's futility and most importantly for the disastrous unintended consequences (e.g. violent , organized crime) that the "War on Drugs" produces, some of which we are still battling today.
I strongly encourage everyone to read Dan Baum's feature article in the April 2016 edition of Harper's and listen to the interview with him on NPR's Weekend Edition radio show.