Hi and welcome to the board. If you are vaping constantly, and were not a chain smoker previously, you may already be too low on the nic. It's not easy to say, some people have an addiction to the hand-to-mouth motion as strong, or stronger, than the nic dependency. I do. I started years ago on 18mg juice and am down to 3mg today. But I still need the mod to keep my hand busy. Chrissie has good advice. Don't rush it, that's a good way to go back to the sticks. You don't say what kind of gear you're using, but one idea might be to keep a tank/carto filled with high-nic juice, preferably in your favorite flavor, just in case. Then you can cut your nic in the juice in your go-to tank if you like. And if the cravings get bad, pop on the other one and have a few hits. Might want to try that first thing, too, to stop the "morning cigarette" urge, or after meals, or when drinking, or whenever it hits you hard.
If you were a chain smoker, then you might need to chain vape to keep your hand busy, no matter what nic you're using. You haven't told us a lot yet. How much did you smoke when you were, for starters, and what kind of gear are you using? That'll help me to advise you.