TL/DR version: I wouldn't recommend anything I used back in the day. These now obsolete products enabled me to quit smoking, but there's much better stuff to be had.
I started smoking 45 years ago and worked my way up to over a pack a day. I tried all the usual quitting methods, e.g., cold turkey, hypnotism, wellbutrin, inspirational books, patches and gum. Nothing worked, so I figured I might as well enjoy smoking until it killed me.
Then along came cigalikes, so I tried various brands. Totally unsatisfactory. So I smoked for another year.
To answer you question directly, about 5 years ago I found more advanced products such as EGOs, Vision Spinners and later some made by Kangertech and Aspire (there are much better products available now). With virtually no effort on my part, I completely quit smoking after only a week. I do not miss smoking and have no cravings. I started with 36 mg/ml of 50pg/50vg tobacco flavor, specifically Red Luck from MyFreedomSmokes. Sorta tastes like cigarettes. Sorta. Vaped that exclusively for a couple of years and then dabbled with other flavors. Didn't find anything I was crazy about--too much like candy. Then I found some nice liquids at a local vape shop: banana nut muffin and breakfast blend (coffee flavor). Vaped those for over a year.
Now I DIY and have made all kinds of flavors. My nic strength is now 8mg. My current mods include a custom made bottom feeder ("squonker") made from exotic wood, REOS squonkers, iStick Pico, several other iSticks and a ProVari. Toppers include two "nuppin" BFAs with two more on the way (get your order in by tomorrow if you want a chance at one), TopTank Mini, Kayfuns (v5 and v3 Mini), Serpent Mini, Bellus, Griffin, Steam Crave, the good ol' Nautilus and Kangertech Aerotank 2. All of these are capable of providing a satisfying vape, each with its own advantages and disadvantages. Nuppins on squonkers are my favorites.
Without going into a lot of detail, the improvements in my health have been remarkable.
If you have any questions, there are lots of people more knowledgeable than I who will happily offer advice and support.