I stopped smoking 6 years ago using an ecig but have stupidly restarted. Want to get an ecig asap so I can stop but no idea where to start. Things have moved on a lot and I don't know anything about the new kits. What is sub ohm and mouth to lung? I would be using fairly low nicotine liquid and wanting to move to nicotine free quite quickly. Not looking to spend a fortune on a kit (prefer less than £50). Can anyone help?