Read what Nude Nicotine says about their salts.
Nicotine Salt Solutions - Nude Nicotine
As for the difference between freebase nicotine and nicotine salts, there is none outside of the character of the inhale.
None.
You don't absorb salts (as they are made today) any differently than you do freebase nicotine, I've used both.
What is different about salts is the character of the inhale - meaning you can vape a higher nicotine percentage in your ejuice when smooth salts are used - thus, get more satisfaction out of a lower powered MTL device where your vaping far less ejuice per day.
You can do one of two things, you can vape a higher nicotine percentage of ejuice and just vape way less (1 - 2 ml per day) or you can vape regular freebase nicotine at lower percentages but vape a larger quantity (5 -15 ml per day or more)
Salts just make a lesser consumption still just as satisfying as the higher but without tearing up your throat.
Let me try to give example here..
Someone vaping a juul, for instance, is going through about 1-2 ml per day of 45 mg nicotine ejuice.
Someone vaping at lower wattages might go through 5ml per day of 12 - 18 mg nicotine ejuice
And someone vaping at higher wattages might go through 10 - 15 ml per day of 3mg or 6mg juice.
So your comparing daily consumption amounts.
Juul = 45mg - 90 mg per day.
Lower wattage vaping = 60mg - 90 mg per day
Higher wattage vaping = 30 - 45mg per dayif using the 3mg juice to 60 - 90mg per day if using the 6mg..
The daily consumption of
nicotine is fairly well identical in all cases... it's just how much ejuice you want to consume in order to get the same amount of nicotine..
And since the purpose of vaping is ultimately to get nicotine, some people just prefer a lower consumption with the same nicotine effect and to be honest that is likely the healthiest option.. just my opinion that though..