Welcome to ECF and to
vaping, tyberious!
Let me answer your second question first (because it's easy

): Nicotine level plays a major role in
throat hit, but none at all in vapor production. I'm not sure whether vapor production impacts how much nicotine is being absorbed into your system. Kent C comments on that in the post below mine.
Now onto your first question.
I provided a
rough guide to selecting nicotine level in
Part 3 of the WWV Illustrated Guide referenced in my signature. And I made the following more detailed suggestions in the second half of
Part 5:
Very likely, the five prefilled cartridges included in your starter kit will be at varying strengths: None (0mg), Low (6-8mg), Medium (11-12mg), High (18mg), and, perhaps, Extra High (24mg). [Those mg levels vary.] You might want to start vaping the second strongest cartridge. If it seems too strong, try out the next one down, then one more down, if needed … or if it’s just not packing enough punch (e.g., you were a pretty heavy smoker), try the strongest cartridge. If that is 18mg and it’s still not strong enough, you’ll probably need the Extra High level.
And see if you enjoy the 0mg cartridge, e.g., for the “pacifier” vaping mentioned in Part 3.
But I’ve recommended that you also include e-liquid in your initial order. So order at least three bottles (10 ml or smaller) at different nicotine levels. Use the loose guidelines provided in Part 3 to set the level for one of those bottles … and order one bottle a notch lower and one a notch higher. Base the nicotine level of you next juice order (probably in larger sizes) on your experience with those carts and e-liquids.
The right nicotine level for you will also depend on how often you vape. If you just vape five minutes at a time at the same frequency as your smoke breaks, your body will crave higher nicotine levels than if you vape more frequently and/or for longer periods.
And remember, some devices (especially the hybrids [i.e., battery mods]) pack more punch (i.e., throat hit) than others. That’s because they vaporize and deliver more liquid (and therefore more nicotine) per puff … and/or at higher temperatures. Many vapers who move up to 5-6V hybrids, for example, say they need to cut back on their nicotine levels.
Hope this helps!
And don't view that experimentation with nicotine levels as a "waste." You are making an
investment in a significant life change. Compare the cost of those sample size bottles with what you've been
wasting on cigarettes. And if you find that the middle level you ordered is right for you, you can mix the higher and lower level bottles to arrive at the same place ... or offer them for sale in the
Classifieds and swaps forum.
For more information on Nicotine, check out the
forum of that name here on ECF.
Enjoy your exploration of this wonderful world of vaping, tyberious!