Before I quit smoking and started vaping, I was a very heavy smoker, over 3 packs a day of full strength cigs. And I'd been smoking for over 30 years.
Overnight, as soon as I bought an eGo, I cut down to about a pack and a half a day. But it took me several months to get off the cigs completely.
For me, what I needed in order to make the switch was more nicotine. I started with 24 mg juice, and it helped me cut down, but especially right after meals, I couldn't vape enough to make the cravings for a cig go away.
I bought some 30mg juice, and as soon as I started using it, I was able to quit the cigs easily. I had half an open pack and 6 full packs left in the carton when I quit. Once I had the 30mg juice, I simply didn't need them. And I didn't use the 30mg juice all the time. I just dripped it into an atomizer when I felt cig cravings, and used the 24mg as my "all day" juice.
That worked very well, and it didn't take long before I didn't need the 30mg anymore. In fact, I still have some of it, and I've cut down to using 18mg juice. The next time I buy juice, I plan to order 12mg.
I was told when I started not to push too hard. They told me to vape when I wanted to vape, and smoke if I felt like smoking. They told me that if I actually wanted to quit, and kept to that plan, that it would work. And they were right. I think it's good advice.
After a couple of weeks of doing both, I started noticing that a lot of the cigs I was smoking were "habit" cigs that I'd light without thinking, and that as soon as I took the first puff I'd think "Dang, I didn't need that, I should have just vaped". So I started keeping the cigs on a shelf far enough away that I couldn't grab one out of habit, while my PV was right next to me. I think it's when I started thinking that way that I actually started to believe that vaping was working for me and I'd be able to quit the cigs.
I'm pretty sure I'd have quit faster and easier if I had bought some higher nic juice right away. And I'm pretty sure that if I hadn't ever bought any higher nic juice that I would have had a lot more trouble quitting. (I might even be still smoking if it wasn't for the higher nic juice.)
I'd suggest you get one bottle of juice at a higher nic level and use it when you're getting cig cravings. I know it worked for me.