Is it safe to mix different nicotine levels in e-liquid with funky lands (republic) vape?

Nicotine for vaping is usually sold in a liquid solution. Usually, you'll buy a mixture of nicotine and PG (propylene glycol), but you can also buy it in other variants, even mixed with VG (vegetable glycerin). Now, this is very important to know, because before placing an order, you must consider exactly under what circumstances you will need to use it.