It is interesting to note that
"Portuguese police officers will turn a blind eye to England supporters who openly smoke cannabis during Euro 2004, having decided that a stoned crowd is easier to control than a drunk one."
It's OK to smoke dope, England fans told | UK news | The Guardian
It turns out that during Euro 2004 the matches that were held in dope smoking Netherlads were less violent than those held in prohibitionist Belgium. Apparently when people drink they are more violent than when they smoke marijuana. Who knew? This is just one of many reasons why the War on Drugs is counter productive.