I am new to vaping (two weeks in and two weeks without analogs). I picked up a lavatube and currently I have it and two 7mL tanks from Volcanoecigs.com. I love it so far, but thought I would ask some of those out there are the carto tanks the best? I currently go through a 7mL tank in about three days. One of the things I've found out is once I get a flavor I don't use it much after three days if that. So this big tank (which doesn't actually hold 7mL) is a little much maybe.? Are the RBA's better? The carto's I use are single coil 3ohm. Just looking for the best bet for what and how I use my APV. All help is appreciated.