You can try something with the juice you already have, add a drop or two (literally a drop or two) of lemon juice. Lemon is often used to add a sour note to DIY juices. It also takes the "edginess" off. Try with one and see if it helps you.
Also, I agree that the queazy feeling is probably caused by the nicotine level. I smoked for about 40 years and use a 12mg nicotine level.