Mint oils are safer than most. First, it takes an extremely small amount to have a big flavor impact. Second, they are not like veggy or mineral oil. Third, the known cases of mineral or veggy oil causing problems with lungs is heavily concentrated in a small subset of the population known as Fire Eaters, so even the oils that are bad for you tend to take quite a bit of inhalation.
I use mint oils and have for years. I know other mixers that have used them a long time too.
Regardless, there will be plenty of posters shouting about the risk of all oils no-matter what type. Don't know why exactly, but they do. I figure the risk for lung problems is just slightly lower than the risk of getting cancer from eating grilled foods which is well within my risk acceptance parameters.
Now, you have another opinion. Use it for whatever you like.