I have been buying juices with 24 mg nicotine and I tried to ask the provider of my favorite juices to increase the nicotine level to 36 mg but they all refused (nicely), seems to me that 24 mg nicotine does not satisfy my craving so I decided reluctantly (I understand how dangerous this substance is) to buy my own Nicotine and mix it with my juices but I don't know where and how!! any help would be appreciated!!