Time for an update:
After puffing on 50/50 water/VG solution at 10mg/mL nicotine strength for 5 days, we both noticed a sore throat and slightly phlegmy lungs. We changed to 60/40 at 6mg/mL nicotine strength the next day...
And then we read
@broken.english's post about pH of e-liquids:
D'OH!
We used pH strips and tested various solutions:
- Commercial 50/50 PG/VG 9mg:
6.5
- Commercial 70/30 PG/VG 6mg:
6.5
So far, so good, right? The pH of mouth/throat is 6.5... But:
- Our 50/50 H2O/VG 6mg:
9
- Our 50/50 H2O/VG 10mg:
9+
So we made an ascorbic acid solution and kept adding drops of it while testing pH (instead of just using pure distilled water).
The Vit C solution is 0.05%: 5g of Vit C in 100mL of distilled water.
We now have a 60/40 VG/H2O solution at 6mg/mL that is pH 6.5.
Made it like so:
- 3mL nicotine (100% VG)
- 3mL VG
- 2mL distilled water
- 22 drops Vit C solution
[shake & test pH here, should be 6.5]
- Top off with distilled water until you get a full 10mL bottle! 20 drops = 1mL
It's
WAAAAY gentler than the old stuff we made!!
We tried it for a few days and indeed, the irritation cleared up.
Apparently, store-bought stuff often includes benzoic acid to neutralize the alkaline nicotine. VG is pretty neutral. Don't have any PG to test. Our almost-pure distilled water is 6.5.
Today, I brewed a batch of 70/30 VG/H2O at 6mg, pH balanced! Even 60/40 was a bit too watery and not so pleasant to puff on all day.
It appears that some nicotine boosters are pH balanced, and some are not. The ones we bought online definitely were not. They are off-the-charts alkaline.
So, if you make your own brews, be very careful about the pH of the end product. If it's not 6.5-7, you're in big trouble!