I've been e-smoking going on 14 months now, and I think I'm significantly better from a health standpoint than when I smoked 30 cigarettes a day.
My last thorough physical was last year, although I have interim blood tests done. At that time, my chest x-ray was clean, my lung function was as good as it gets, my heart did great on a treadmill stress test, and my blood work showed only high cholesterol. A year on drugs brought the cholesterol and HDL/LDL ratio to perfection.
But a problem for us all is which new symptoms or problems might have been caused by e-smoking, and which would have occured no matter what? I still cough -- a productive cough -- as they say. A cough on inhalation is the body rejecting the air just inhaled. You'll cough when encountering severe pollution -- "find clean air", your lungs are saying. So the cough bothers me still, and I'll ask about it with my next exam.
I'm also plagued with cramps. Toe cramps multiple times a day; leg cramps at night; finger cramps that can curl hands in pain. The cramps mostly came when I went off cigs and onto e-cigs. Is this caused by the propylene glycol breaking down into lactic acid -- too much for my body to handle, so it cramps in protest, as a muscle might following strenuous, lactic-acid producing exercise? Or is it just aging? I don't know. But my suspicions here point to e-smoking as the cause.
Overall, I think our beloved practice tilts far to the "good" side of things. But I'm keeping an eye open for the "bad" stuff. Someone wrote not long ago that one cigarette doesn't kill you, but years of smoking them certainly can. Is the same true of what we inhale?