Electronic cigarettes

Liquids

E-liquid, or e-juice, is made up of two main ingredients: Propylene Glycol (PG) and Vegetable Glycerin (VG), as well as artificial flavorings.

PG is a low viscosity liquid and has many applications ranging from the suspension agent used in some inhalers, to an ingredient in FDA approved oral and topical medications, as well as a preservative in food and tobacco products. VG is a high viscosity liquid organic compound with applications from use in foods (as a sweetener), medications, soaps, and cosmetics.

As PG is a humectant it is common to have a sore throat and cough when you first start vaping. If similar symptoms persist or become more severe e.g. sore or swollen mouth, face, gums, and/or back of throat, you should consider switching to a 100% VG concentration as you may be allergic or sensitive to PG.

The percentage of PG/VG is commonly 50/50, but what works best for you depends on your e-cigarette itself, personal preference, and their vaping properties. 100% VG puts out a lot of vapor, produces little to no throat hit, but mutes the flavor while 100% PG is the opposite. VG also has a relatively high resistance to the heat most atomizers put out, while a higher PG concentration might taste burnt at the same wattage.

Recommended e-liquids

Flavor is subjective and boils down to personal taste: general e-liquid recommendations are hard and established preferences might not apply to e-liquid flavors e.g. one might prefer menthol cigarettes but dislike menthol e-liquid while preferring "tobacco" or coffee flavors. Your tastes will most likely change after you've quit smoking, or you might grow tired of a certain flavor, so it's recommended that you have several or more different preferred e-liquids. Mixtures and bases also vary among vendors so you may find that you prefer a fruit flavor from a certain vendor over others.