After smoking for over 40 years, I began vaping a year ago. Within 2 days I stopped coughing. I haven't had a bronchial infection, which I usually get at least once a year, since. However, I became extremely fatigued and experienced severe aches and burning eyes. Looking up the burning eyes as a symptom, I found that can indicate....poisoning!
Very happy to no longer smell like an ashtray, but very UN happy to be too tired to live, I lowered my dosage from 36 mg carts to 4. My symptoms have diminished, no more burning eyes, but I still am far from the energetic gal I was.
I read recently that the Chinese produced cartridges and juice are made from industrial grade nicotine (used as poison, basically), etc. I just ordered juice from an American company claiming the product to be much safer. It will be very interesting to see if this makes a significant difference in my energy level! I'm convinced the product from China is dangerous, particularly at high levels. However, this is the only thing that I've been successful at using to stop smoking and smoke is the killer.