The longevity or life of a disposable vape is measured by what is referred to as a “puff count.” That is, it represents approximately how many puffs or hits you can take from the device before it must be discarded. It is important to note that puff counts are not exact depictions, but rather rough estimations. Some units may last a bit longer than the listed puff count, while other may last slightly less.
Regarding flavor selection, there are 5 basic e-liquid flavor categories: fruit, tobacco, drink, candy, dessert, and menthol. Of course, there are flavors that combine these categories, but those are the basic ones. The best way to figure out which flavor categories you like is to simply try them out. Purchase numerous small sizes of various e-liquids to try. You will know right away which ones you love and which ones you hate. Once you have a basic understanding of the flavor types you enjoy, keep trying e-liquids within those flavor categories until you have a set of them that you absolutely love.
To determine the nicotine strength to use, it is important to first understand what your current habits are. If you are a cigarette smoker, then you will likely want to select a nicotine strength based on how heavy of a smoker you are. In time, you can gradually reduce the amount of nicotine until you reach zero. If you are currently not a cigarette smoker, it would be best to use 0mg nicotine.