So I've been wondering about the difference - whenever I google I just run into Wikipedia pages about Glycerol (which is the pharmaceutical name for Glycerin)
Finally my google-fu paid off and here is what I found
http://www.wisegeek.com/what-is-vegetable-glycerin.htm#didyouknowout
Glycerin, also known as glycerol, is an organic compound of carbon, hydrogen and oxygen with the chemical formula C3H8O3. It is produced industrially, usually as a by-product of soap manufacture, from oils and fats. It can be made from animal fat or, in the case of vegetable glycerin, vegetable oil. The source of the raw material does not affect the chemistry of the final product, but, since glycerin is widely used in foods and medications, this distinction is important for vegetarians. It is also used as a sweetener and as an ingredient in a number of cosmetic products."
So if you're a meat eater like me - either will do - if you are vegetarian or vegan - then you want to go for the vegetable glycerin and murder some plants rather than animals for your e-cig habit
Finally my google-fu paid off and here is what I found
http://www.wisegeek.com/what-is-vegetable-glycerin.htm#didyouknowout
Glycerin, also known as glycerol, is an organic compound of carbon, hydrogen and oxygen with the chemical formula C3H8O3. It is produced industrially, usually as a by-product of soap manufacture, from oils and fats. It can be made from animal fat or, in the case of vegetable glycerin, vegetable oil. The source of the raw material does not affect the chemistry of the final product, but, since glycerin is widely used in foods and medications, this distinction is important for vegetarians. It is also used as a sweetener and as an ingredient in a number of cosmetic products."
So if you're a meat eater like me - either will do - if you are vegetarian or vegan - then you want to go for the vegetable glycerin and murder some plants rather than animals for your e-cig habit