What is Propylene Glycol?

Propylene Glycol (PG) was not initially used for vapor smoking,
as it is commonly used in many household products. These include:

  • Diazepam (as the solvent in the injectable form of the
    product) and other pharmaceutical medicines.
  • A carrier liquid in fragrences
  • Massage oils
  • Emulsification agent
  • Smoke machines in order to create the smoke seen in the
    theater and for fire fighting training
  • Hand sanitizers
  • Solvent for food coloring
  • Cooling agent for wine and beer
  • Moisture stabilization for Swedish Snus.
  • Coolant in some liquid cooling systems
  • In cigar humidors
  • De-icing of aircraft
  • In deodorant sticks
  • A working fluid in hyrdaulic presses
  • An ingredient in UV or blacklight tattoo ink

Other products that make use of Propylene Glycol include
cosmetic products, food coloring, cake mixes, sodas, salad dressings, and
toiletries. PG is also used as an active ingredient in fog machines used in
industry, nightclubs, and theaters.

What Are the Known Side Effects of Propylene Glycol?
Some of the side effects experienced by people that use Propylene Glycol are muscle
pain, sore throat, and a stronger smelling urine. These symptoms can all result
from using e-cigs that have  Propylene Glycol-based e liquid in their cartridge.
Since PG is considered a humectant (it collects moisture), your throat can
become dry after use and potentially sore. It can also result in an increase of
lactic acid production by your body causing muscle aches that occur more often
than normal. In order to counter-act these symptoms, it is recommended that you
increase your fluid intake in order to flush the lactic acid from your body more
quickly. This will also help with alleviating your sore throat more quickly
which normally disappears after a few days. If you find yourself beginning to
suffer from bowel movements, a rash, or having night sweats you may be allergic
to propylene glycol. If this occurs, you will need to seek out an electronic
cigarette solution that is vegetable glycerine (VG) based instead.

What to Do if You Are Allergic to Propylene Glycol?
If you are allergic to Propylene Glycol it does not mean that you have to give up on
electronic cigarettes. Many e-cig manufacturers produce products that either use
VG or have it available as an alternative to Propylene Glycol. VG also produces
an ordor-less vapor though it is considered to be a bit thicker and sweeter than
PG. Vegetable glycerine is also known as Glycerin, Glycerine, VG, or Glycerol.
United States Pharmacopeia and Europe Pharmacopoeia produce ?food safe? versions of propylene glycol and vegetable glycerine.