I like menthol but was disappointed in all the menthols I tried. They seem to like to mix other things in with the menthol,like wintergreen, which ruins it for me. So now I DIY.
I just buy the raw nicotine juice and add 15 drops of menthol to a 30 ml bottle. I also add 10 drops of lemon, but this is optional.Other choices might be some coffee or watermelon.
You can start off with fewer drops and add more if you like. It's very simple.
DIY is also MUCH cheaper than buying juice. Maybe 5% to 20% of the cost. (Haven't figured it out lately.)