I wouldn't , same with cinnamon flavours aren't safe for inhalation the purest form s of the flavor says right on the bottle do not breathe but is food safe , food safe doesn't mean lung safe

it's a precursor to polymer production...

Here's what the CDC says about isophorone (https://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=762&tid=148)

##How can isophorone affect my health?

The only effects of isophorone reported by people who have been exposed are irritation of the skin, eyes, nose, and throat, and dizziness and fatigue. These effects have occurred in workers who breathed vapors of isophorone and other chemicals in the printing industry.

Short-term exposure of animals to high levels of isophorone has caused inactivity and coma. Some animal studies suggest that isophorone may cause birth defects and slower growth in the offspring of rats and mice that breathed the vapors during pregnancy. These studies found some harmful health effects in adult female animals. When rats and mice were given high doses of isophorone in food or water for a long time, the male rats developed kidney disease.

##How likely is isophorone to cause cancer?

No studies are available on whether isophorone causes cancer in people. In male rats, isophorone caused an increase in tumors of the kidney, liver, and lymph and reproductive glands when they were exposed to it by ingestion. There was no increase in tumors in female rats or mice. The EPA has determined that isophorone is a possible human carcinogen, based on adequate evidence in animals and inadequate evidence in people.