I have heard they are hard on atty's but I've also heard it takes so little that it doesn't really hurt them, so I haven't tried. I do have some Spearmint Tasty Puffs and I know Tasty Puffs don't hurt my attys. I've been using them in liquid in the same atty for 6 weeks and it still vapes like new. I found a great Peppermint flavor (tastes like candy canes) from Capella called Cool Mint and all of their flavors are water soluble. The Cool Mint mixed with Capella's Double Chocolate tastes like Thin Mint Girl Scout Cookies or those Andes After Dinner Mints.