The "learning more about the addiction" is a really important part of the process. When you truly believe that smoking does nothing positive for you and only takes from you, it's easier then to ignore that "junky" voice in your head trying to convince you to take another puff. That took a while for me to truly understand and believe that concept.
Changing up your routine, even in very small ways, can also be helpful. Many people will say that first hit in the morning, maybe with your coffee, is the worst one to get over. Switch up to a glass of juice or something or jump in the shower right away just to change things up a little. Worked for me. You may not be into coffee but that's just an example.
Will your quit be easier because of your prior vape routine (reducing nicotine gradually)? I am doubtful that will make much of a difference because, you have been taking in some nicotine and continuing the "smoking motions" all along. It's not just clearing the nicotine out of your system, the longest part of the journey is retraining your brain to function comfortably without going through those smoking motions every hour or so. Just think about all the time in your day that you spend either actually smoking or thinking about it. When I say thinking about it I mean planning when and where to smoke, making sure you have supplies, not forgetting them when you go somewhere .... the list goes on and on. When you stop altogether, you suddenly have all this free mental and physical time on your hands. What to do with all that time now??? That's when the anxiety ramps up for many people. Don't know how to fill all this time so they get anxious. Brain needs to be retrained and that takes time and repetition.
I haven't researched the dopamine thing but if you have and believe you can assist your brain in dealing with the change through diet and/or exercise then go for it! Certainly can't hurt and may in fact help you. The big positive you have going for you PP is that your have already been reading and doing a lot of thinking about this quitting thing. That will help a lot when it comes to dealing with the early quit symptoms!
No one ever knows how easy or difficult ones quit will be. All of us here on this board with months or years worth of quit time has gone through the early days and had to summons the determination to stay quit when our addiction is screaming out to be fed. You are no different than any of us. You will face challenges and you WILL be able to overcome them providing you are and remain committed to your quit being your number one life priority for the early days.
The choice is up to you to make. The hard work will be up to you to do. We will be here to support and encourage you along the way