According to the EPA here are the heath ramifications of VOCS:
Eye, nose, and throat irritation; headaches, loss of coordination, nausea; damage to liver, kidney, and central nervous system. Some organics can cause cancer in animals; some are suspected or known to cause cancer in humans. Key signs or symptoms associated with exposure to VOCs include conjunctival irritation, nose and throat discomfort, headache, allergic skin reaction, dyspnea, declines in serum cholinesterase levels, nausea, emesis, epistaxis, fatigue, dizziness.
The ability of organic chemicals to cause health effects varies greatly from those that are highly toxic, to those with no known health effect. As with other pollutants, the extent and nature of the health effect will depend on many factors including level of exposure and length of time exposed. Eye and respiratory tract irritation, headaches, dizziness, visual disorders, and memory impairment are among the immediate symptoms that some people have experienced soon after exposure to some organics. At present, not much is known about what health effects occur from the levels of organics usually found in homes. Many organic compounds are known to cause cancer in animals; some are suspected of causing, or are known to cause, cancer in humans.
As someone who suffers from migraines and would like to limit my use or exposure of chemicals that can cause cancer I was on board.
So following the tutorial this is what I did:
I started with a couple of empty wall flowers in my favorite sent eucalyptus spearmint.
Using a pair of pliers you have to pull out the wick. This can be a little tricky if it is not budging easily use a butter knife to loosen it out a little.
Pull it out beware of the little nail.
You will then have some empty bottles. I filled according to the instructions about a third of the way full of essential oils. Twenty drops of spearmint and ten drops of eucalyptus, as eucalyptus is a super intense smell.
Enjoy! I will report back on how they work out.