Sub-ohm Vaping – If you want to try sub-ohm vaping then you may need to rethink your nicotine level. As well as an increased level of VG you will likely need to reduce nicotine, as the inhalation from a sub-ohm vape is more powerful than standard vaping. As you consume more juice in a single hit so it follows that you take in more nicotine, leading to the risk of mild nicotine overdose. Juice for sub-ohm vaping generally comes in one of three strengths, 0mg, 3mg and 6mg. You can sub-ohm with higher than this, but, be forewarned, it will likely be unpleasant for a lot vapers.
Deterioration – PG, VG, and nicotine tend to degrade over time, with nicotine degrading a bit more rapidly. Flavouring also fades, but to a lesser degree. As time passes nicotine will turn a yellowy-brown colour, and take on a peppery, stale odour. But many vapers vape e-juice that has aged for long periods, since the nicotine in e-juice isn’t at a high enough level to catastrophically alter the taste. When in doubt, throw it out. But if it tastes good, go for it.
Side-effects – While vaping means less exposure to harmful chemicals found in smoking tobacco, it doesn’t mean nicotine is totally harmless in and of itself. There is a general consensus (although it’s increasingly debated) that nicotine is addictive; it is classed as moderate-low for physical dependence and moderate-high for psychological dependence. It has been shown to raise blood pressure, elevate heart rate (both at the time of consumption) and is not recommended if used during pregnancy. Conversely, it also has performance-enhancing abilities, particularly when it comes to attention, memory and motor skills. f you look closely, the pros and cons closely mirror the effects of caffeine.
Impact Time – Nicotine from cigarette smoke reaches the brain in under 10 seconds, and it reaches the central nervous system in under five minutes. However, anecdotal evidence suggest the particle size of cigarette smoke is much smaller than those found in vapour from e-juice. This implies the absorption of nicotine from vaping can take longer than smoking, perhaps up to 30 seconds before it reaches the brain. It is often suggested that smoking causes a harder faster nicotine hit, while vaping has a gentler, slower effect. Again, more studies are needed to get a true picture of this.
Time In System – As with smoking, this depends on a number of circumstances such as metabolism and length of time spent as a smoker or vaper (and the amount/strength of the nicotine consumed), but traces of nicotine (via its metabolite, cotinine) is usually detectable for 48 to 72 hours after your last intake. Cotinine tests can be purchased cheaply if you want to check for yourself.