Yes, it is considered very safe, and is commonly used in foods and medical inhalants. That said, MANY here cannot tolerate it, due to its dehydrating effect on their mouths,
throats, lungs and even digestive tracks. I am one of those people. I only
vape VG juices, which has none of these symptoms for me. I also do not need to constantly drink water, which doesn't really help with my PG issues. This is also generally the reason people switch to 100% VG juices. Sort of like hot peppers: very safe, but for some not very pleasant.