Get enough juice to last between mailings, and so that you can skip vaping something you end up hating. I'd suggest several 10ml bottles. You will probably go through about 5ml per day of something....so don't let yourself run out. Everything you're getting sounds great. Good luck. You are going to be amazed at how easy it will actually be to get off cigarettes! Keep us informed.
1 mg cannot always = 1 ml. Otherwise, in our case all our juice would be the same strength, and healthcare professionals would not need all this complicated math.