Cannabis use may also double the stroke risk in young adults besides being linked with heart attack and emphysema a progressive lung disease causing shortness of breath says a new study. Brain research scientists from the University of Auckland showed that those who suffered ischemic stroke (loss of blood supply to the brain) or transient ischemic attack (TIA) when blood flow to the brain stops momentarily) were 2.3 times more likely to have cannabis detected in urine tests as other age and sex matched patients. ‘This is the first case-controlled study to show a possible link to the increased risk