Okay...here is a simple way to understand steeping (and I know I quoted you Katz, but I'll get to that part in a minute
)....I think everyone will agree that some foods, such as soups, stews, spaghetti sauce, etc ALWAYS taste better the next day. Or even the ALL day cooking of some of the same types of foods on low heat.....well, that is basically what steeping is. It is giving all the components in the mix time to infuse with one another and become the most flavorful. For E-juice, some flavors need longer than others...tobacco's seem to need the longest to come to fruition, then the creamy flavors such as vanilla...fruits tend to need the least and some need none at all.
Now for why I quoted the pretty pretty kitty
Katz, there is a way to speed the steeping process in DIY juices. Mix the flavoring with the unflavored juice (no nicotine liquid at this point), and place it in a bowl or glass of Hot water....once the water has cooled to room temp, shake up the mix and you can either repeat this, or add your nic juice.....You do not want to heat the nicotine as it will degrade quicker.....heat, oxygen, and uv light are nicotine liquids worst enemies....so be sure to heat the 0 nic mix first and after it cools add the nic to the mixture.....now is that clear as mud or what