I have an LT and I usually vape the vision cartoes with no problem . I have just received my order from MV and have a smoktech carto tank with 1.5. ohm. When I put it on my LT it won't fire at all, no vapor no gurgling ). It does produce some vapor on an eGo battery. So the question is, is it due to carto's ohms or do I need some sort of 510 extender (I remember seeing it somewhere but cannot find)