I'm brand new to vaping, and would like to start making my own ejuice. I've read a lot about different recipies, but I get confused. I would like to order just the base, 50/50 pg,vg, with Nic. @ 18%mg. I assumed any flavouring would have no Nic. In them, they are there just to add flavour. I've seen some tobacco flavouring (I want to start with tobacco EJuice) , but the site where I was going to purchase the tobb.additive,and they asked what Nic.level I wanted? Do all flavouring agents have Nic.in them? If I ordered the liquid.nic.,should it match the base, in my case 18%? Also, I'm a very heavy smoker,50 cigs a day, is 18% too weak a dose? I haven't even vaped yet, I just ordered a kanger mega ecigarette from COOLVAPE ,with 18% B&h EJ.