Hi all. I'm sorry, I'm sure these questions have been answered 100 times before, but I'm overwhelmed with info so would appreciate your help. I've been vaping full time for a month with a kanga evod and I'm pretty happy with it. After experimenting with lots of flavours I've found a couple I'm happy with and plan to stick to (there's been a lot of wastage!) I've used up the spare coils that came with my starter pack but now I'm wondering how often I should replace them and how I know when to. Also what do I replace them with? Do I need to replace the tanks at any point and again how do I know when?