The two most common terms associated with e-juice are VG and PG. This can seem confusing to the newcomer, but knowledge of these two ingredients can improve your vaping experience.
In simple terms:
Choosing the wrong PG/VG ratio can put first-timers off so be careful to choose the right level for your equipment.
Now let’s take a look at each in more detail.
PG stands for Propylene Glycol, a petroleum by-product. The fluid has no odor or color and is less viscous than VG. In vaping it is used to provide a ‘throat hit’, which some users claim is similar to the sensation experienced when smoking tobacco. It also carries flavor more effectively than VG, making it the most commonly used suspension fluid for flavor concentrates and nicotine.
Propylene Glycol can be found in various common household items. Amongst others, these include:
Studies have shown that PG is safe to ingest orally, and the FDA has deemed it “generally recognized as safe” to be used as a food additive. However, most studies into the safety of propylene glycol look at ingestion, rather than consuming it in aerosol form. Of the limited studies that exist, a long-term experiment held in 1947 judged that inhaling PG was ‘completely harmless’.
A 2010 study looking at PGEs (a mixture of propylene glycol and glycol ethers) suggested an increased risk of developing respiratory and immune disorders in children, such as asthma, hay fever and eczema. However, it was judged that glycol ethers, and not PG, are the more likely cause. Looking at the evidence, it is sensible to assume that PG is safe to be inhaled, but there is a need for more comprehensive studies to confirm this.
Many misinformed scaremongering stories in the media claim that PG is a toxic substance used in anti-freeze. However, there are two types of anti-freeze: toxic and “non-toxic”. The toxic anti-freeze uses the dangerous substance referred to as ethylene glycol, which is not used in vaping. PG-based anti-freeze is used in food-processing machinery where toxic anti-freeze could be problematic.
While PG is regarded as safe for humans and is generally regarded as safe as a food additive for dogs, it has been linked to Heinz body anemia in cats. Be careful when vaping around cats, particularly if you use PG in your e-liquid.
Some people find a high level of PG irritating to the throat. True allergies to PG are rare, but have been reported. If you find yourself coming out in a rash or suffering other unpleasant reactions after using PG-based e-fluid, you may have a more common mild sensitivity to PG, and should look at using high-VG juice instead. Many vendors offer this option.
The most common side effects of using e-liquid containing propylene glycol are symptoms of dehydration, like dry mouth, sore throat, and increased thirst. It is advised to drink more water and liquids than usual for the first few weeks of using your e-cigarette. If hydrated properly, these symptoms usually last anywhere from a few days to a week as the body gets used to the propylene glycol. Be aware that any unusual reactions could be side effects from quitting smoking, and not necessarily because of the PG.
VG stands for Vegetable Glycerin. It is a natural chemical, derived from vegetable oils, so is safe for vegetarians. It is commonly used in e-liquid to give a ‘thick’ sensation to vapor. VG has a slightly sweet taste and is considerably thicker than PG. Vegetable Glycerin provides a much smoother throat hit than Propylene Glycol, making it more suitable for sub-ohm vaping. While nicotine and flavorings are commonly suspended in PG, some vendors are offering a VG alternative, to enable 100% VG mixes.
Again, it can be found in numerous medical, food and personal care products:
The FDA has classified VG as “generally recognized as safe” for eating, and it is widely regarded as one of the most benign substances known to man. The SIDS assessment profile show it to have low toxicity when consumed, and low potential to irritate the skin or eye. This, along with the widespread use of VG in food and medicine suggest it is safe for humans. However, as with PG, there are limited studies on VG being inhaled as opposed to ingestion.
A 2008 study of the toxicity of inhaling aerosolized glycerol found minimal risks. We can assume the use of VG in vaping has no serious impact on health but, as with PG, we welcome more detailed studies.
It is important to note that the risk of being allergic to vegetable glycerin is very low, making it a useful alternative for people who have issues when vaping e-juice containing PG. If you are allergic to palm oil or coconut oil then VG could prove a problem, but this is relatively uncommon. Diabetics could possibly experience problems with metabolizing VG, but this would not be an issue at the levels used in vaping.
The increased thickness of VG means it can reduce the life of atomizers quicker than PG-based juice. High VG liquids clog up coils more rapidly, and will not work well, if at all, in certain tanks. Older products are especially susceptible, particularly models that use smaller coils such as clearomizers. The Nautilus range and eGo tanks are some of the more well-known tanks that are known to have difficulties dealing with high VG fluid.
As with PG, the most common side effects of vaping high VG e-liquid are those of dehydration: dry mouth, sore throat, and increased thirst. Again, be sure to drink plenty of water and take a break from vaping if necessary.
There isn’t a one-size-fits-all answer to this. It depends on the kind of vaping experience you prefer. Many people use various levels of PG and VG for different purposes:
It isn’t as simple as deciding on a high VG or PG vape juice and hoping for the best. It all comes down to your equipment. If it isn’t suitable for the job, it can lead to unpleasant throat irritation or wicking problems resulting in dry hits.
The best way to find your PG/VG ‘sweet spot’ to experiment by making your own e-juice. It’s surprisingly easy to do, and very cost-effective. You can check this out in more detail in our DIY e-liquid guide, but here are some things to be aware of:
The basics of PG and VG are quite easy to grasp. They both work in different ways, and each has advantages and disadvantages. Our advice is to start with a 50-50 PG to VG ratio then try out various combinations and see which you prefer. Make sure your vaping setup can deal with the different ratios.
Many vapers like to use different levels of PG and VG at different times, and with various devices and flavors. Tobaccos, fruits and beverage flavors often go well with PG, as the sharpness of the PG blends well with the tart or fizz of the flavoring. Similarly, flavors based on cream, custard and yogurt tend to work well with high VG as the thick mouth sensation adds to the dessert-like feel. There are no fixed rules, just follow what your taste buds tell you!
Hi guys. I’ve been vaping for about 6 years and have tried a lot of different brands of juice. I only vape menthol. Whenever I find a brand I like, invariably it becomes difficult to obtain after a while. My latest brand is ridiculously hard to come by so I’ve decided to delve into the world of mixing my own. The juice I always use is 50/50 menthol. I can buy 1 litre of ready mixed 50/50 juice and 100mls of menthol concentrate for next to nothing. Am I right in thinking that for my needs, just combining the whole… Read more »
I Vape Hard Menthol and I’ve never had a problem
Hi Ian, If you vape on nicotine-free e-liquid then this does sound like a good idea. Here’s a couple of things to consider: 1. Mixing a 50/50 base with a PG based flavor concentrate will result in a juice that has more than 50% PG. If you want a 50/50 end result you will need to use a higher VG base, or add a bit of VG to the mix. 2. Make sure you check the recommended mixing percentage of your concentrate. Depending on the potency of the flavor, it can be from as low as 0.1% to as high… Read more »
why are some e-juices bottle doesn’t show how many pg / vg ?
I’m not sure why. The manufacturer usually provides that information, although it’s not required by law.
I have a bottle of e liquid that18mg VG/Pg 20 80 but I can’t use it because its just to harsh but is there anything I could maybe add to it that would reduce the harshness.. it’s being used with a sub ohm…. Tbh im not really clued up on vaping IV just got one to see if it’ll help me quit smoking…
Hey Tyson, I think the reason why your vape is so harsh is because you are sub ohming 18 mg nicotine, that’s intense! Your best bet at this point is to get the same e-juice in a 0 mg and blend them toghether to create a lower concentration of nicotine. The other option would be to buy another bottle, preferably 3-6 mg this time. I hope that helps, best of luck to you quitting smoking, vape on!
I just bought a smok s priv kit and the flavour I used is called slow blow by nasty juice. It has higher vg than pg (70/30) but it did burn my coil pretty quick, so I was thinking to get a balance of vg to pg ratio flavour but not to sure which flavour to get. I vape on 0mg, so if anyone has any advice or suggestions please drop a response.
If your wick is properly saturated with liquid before you fire the coil, and you’re using a reasonable power level, nothing should burn—no matter what ratio of PG/VG you use.
I use very cheap local e-liquide which do not contain nicotine and they don’t provide ratio of vg/pg i don’t know if it’s safe to vape or not bt it’s seems fine any advice?
Although it’s unusual to not have the PG/VG ratio listed, it’s not unheard of. PG/VG ratios were more of a concern years ago when coils couldn’t wick thick juices. For the most part, nowadays, PG/VG ratio is no hinderance to the vape performing as it should. Of course, you do need to know your nicotine levels, but that’s different.