I'm not translating anyone else's post, but most people don't seem to get the same buzz from vaping as they might have gotten from cigarettes, especially the first one after many hours without. Vaping is still satiating, just not necessarily buzzy. I've read before that part of the cigarette buzz is caused from the combination of the nicotine hitting your system and other chemicals, like carbon monoxide, getting in the way of your oxygen absorption and causing lightheadedness. I'm not sure if that's true or not, but it would make sense to me. I find vaping incredibly satisfying but the sensation and effect of the first vape of the day is not necessarily the exact same as the first cigarette of the day used to be.
Especially when I was smoking unfiltered Camels.... woof. But gross.
Also, on topic, and you seem to have figured this out but you can literally always mix juice together. Always. Just do the math to figure out the resulting nicotine content and know if you mix two different flavors it might not be good, but there is nothing stopping you from mixing stuff. Yes, mixing a higher nicotine juice with a lower nicotine juice will cause the overall nicotine content to go down but otherwise I can't think of a single limiting factor when it comes to experimenting with mixing juices other than not wanting to ruin expensive "premium" mixes.