Cannabis has been interwoven in the fabric of South Asian existence. So where exactly did the stigma around it come from? When Emel, 34, consumed cannabis for the first time, it wasn’t at a house party with a cloud of smoke drifting up and onward, or any other clichéd scene that programs like D.A.R.E. used to warn her about — nor was it this great act of rebellion or dissent by an angsty American teen.…