If both nostrils ain't blocked...do half a line up one ..then the other half up the other....9 times out of ten only one tunnel is clear! That painfull shit is coz your buying it from a shit dealer...but the truth is ALL coke on the street is cut...mostly with glucose and speed[most speed is cut with glucose powder] ain't much you can do except find a better dealer..every dealer along the chain from the lab to the street has cut that charlie to make his money...the lower down the chain you go..the more it's cut...find a guy that sells to dealers ...easier said than done..most 'high rollers' who offload to street dealers don't fuck about with little deals here and there..they only move big weights.