I normaly use drews mega 510 cartos on my Darwin. No problem. It seemed like the lifespan of the cartos is shortening so I ordered some from ikenvape. Pop it in and no draw at all no air comes through at all. Has anyone else had issues with 510 cartos on Darwin? Is it the carto or something I need to fix on the Darwin? My roomie tried it on his ego and it worked? Whus up with that?