The next part you will need to setup is the tax classes used for different vape related items. You can setup as many as you need. You can always add or remove classes later. Here are some examples that you may use.
Think of classes in terms of different product types that could be taxed differently. For example, “No Nicotine” for juice with 0% nicotine, but then “Nic Milliliters” for taxing by the ml. These classes will be assigned to products later on.