I’ve quit twice, first time was with the Alan carr book (lasted 6 months) then 5 years ago i started on the Vapes.. it works! You need to speak to a shop who knows what they are doing and willing to offer advice. If you are still referring to vape juice as oil then im guessing you never got the correct advice!
I mix my own juice and it costs me about £20 for a liter and that lasts me 3-4 months! if you wan’t any advice just ask one of us vapers here and im sure someone will be about to help.
Its hard but stick with it and you WILL do it! Good luck