I have been vaping it for awhile with no ill effects. I think it does irritate the mouth and lungs a bit, but nothing to be too alarmed about. If you are willing to try a little DIY I recommend Flavor Apprentice Cinnamon RedHots flavor at 10%. I can't stop vaping this stuff, its my all day vape. It tastes just like redhots. I would imagine this is the flavoring most of the suppliers are using for redhot flavors. The sample I got from crystal clear vaping tasted just like my DIY.