Funnily enough, a law in Germany just went into effect today that makes it far cheaper (assuming you vape less with more nicotine, certainly holds true for me, I’m on 0mg nowadays) to vape with a lot of nicotine. The law is essentially a tax per ml. But doesn’t care what ml, pure propylene glycol, vegetable glycerine, flavor concentrates, nicotine, whatever, as long as the intended use is for vaping.