Disposables contain nic salt e-liquid usually of a 50/50 ratio. Nicotine salt is created when normal nicotine is paired with a form of acid (like benzoic) which alters the PH and formulation of the compound. Inhaling nicotine salt vs freebase e-liquid gives a much smoother throat hit, and enters your bloodstream a lot quicker. This is why nicotine salt is available in higher doses, like 20mg (2%). You don’t need as much of it to feel satisfied and it’s hard to overdo it as the satisfaction is almost instant. Nic salts can be purchased in 10ml bottles too, so once you move on to a refillable vape you can stick with nic salts. They’re also available in 5mg (0.5%), 10mg (1%), and 20mg (2%) to cater to almost everyone.