Try a higher vg juice. I used to get some minor chest pain / lung heaviness when smoking PG. Im not allergic but being asthmatic with chronic bronchitis it just didnt gel well. Im ok on 50/50 or higher. It depends on the PG too. I cant do MBV pg or any "cheaper" brands. Halo blends are ok and so is Volcano. But I would definitely see a doc. Quitting smoking can wreck your body upside down. I had headaches and muscle aches all sorts of stuff but i got checked out and was ok. Then again i went from 2 packs a day to 6mg nic ejuice so it was a shock.
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