I got some menthol drops from Juicy Liquid about a week ago. They are really easy to use and give an extra kick to stock menthol flavors. I've also found that they are great for a newbie (namely me) because I am buying flavors to try and finding that I don't like some of them. One drop or more per ml turns just about anything into menthol. Had some vanilla I didn't like.... turned it to menthol and can barely taste the vanilla. Had some lemon tea that I really didn't like.... Menthol now. Again, just a tiny hint of lemon. I've also experimented with using liquid splenda to sweeten my concoctions. It's expensive but it goes a very long way. One drop does a whole cup of coffee. One drop in 15ml of eliquid provides a nice sweetness if you like that kind of thing. No idea what it would do to an atomizer. Have had no problems with my cartomizers though.