Ok, ok... I know none of you wonderful people is 'average' and I know it's a bit like asking the length of a piece of string. But - I've also read all the advice about having spares and backups and never running out. I was smoking a pack of Marlboro a day. I have my new Riva on order along with Boge cartos and 5 x 5ml sample bottles. Obviously I'll find my own level of consumption pretty quickly, but I'm looking for a heads-up as to how much juice I should realistically expect to get through?