vaping is extraordinarily expensive for me, so I buy 24 mg and tone it down to 14. I know I'm losing flavor, but it serves two purposes: I have high nic liquid for a hit when I want to smoke, and I fill CE3s with them. And on the other hand it lasts longer (30 ml turns into 50ml). I'm not the kind of DIY, and I'm buying from Heather Heavenly Vapes and Liqua. I really wish vendors carried 50ml bottles, it would be a much better value for those of us living abroad.