I remember really struggling as well to get nic added. The way I got around it was to start a new recipe and then clicked "Add Ingredient". It prompts you for a name so call it "nic 36mg" or whatever. Then click on "Update". In the box that comes up, there's a list on the left that includes "Nicotine" as an option. Select that option, click Save and you're good to go. Every recipe from there on, when you click on the Nicotine box, you will get a drop-down box with "nic 36mg" as an option.