GAZA/JERUSALEM (Reuters) - Palestinians struggling to cope with the Israeli blockade of Gaza and the trauma of war are turning to painkillers and tranquillizers at a rate that risks triggering a wave of addiction. There is also evidence of mounting recreational drug use as Gaza drifts in limbo, with no clear political future. Gaza residents reported health problems after a 22-day Israeli offensive last January, with most citing psychological problems and stress, according to a survey published by the United Nations Gender Task Force on April 21. "With increased trauma and stress and limited access to professional psychosocial services, there...