@houtjet, dank voor de link. Met name het volgende stukje vond ik verhelderende info bevatten:
'Your lungs have little hairs called cilia. Mucus traps particulate matter and then the cilia moves mucus out of the lungs.
If you are a smoker you are coughing because your lungs are trying to move mucus (that is filled with particulate matter) out of your body.
If you find yourself in a city with smog you might find yourself coughing, same process in action.
If you have allergies same thing, the body is trying to 'flush' the toxins out of your body.
Anyway, the particulate matter from a cigarette is around 920 parts per million (after 3 minutes of smoking). Remember in China when they had their smog problem... the air quality had 1,000 parts per million of particulate matter
If you lived there, it was essentially like being trapped in a smoke filled room all the time.
The particulate matter from ecigs after 3 minutes of vaping was found to be 40. So 920 from cigarettes and 40 for ecigs (anything 40 or under is considered safe from an environmental view... ie. if your work place air registered 40 ppm they wouldn't do anything as its perfectly safe for everyone to breath).
Now having said all that, not all particulate matter is made equal. We KNOW that cigarettes contain over 40 carcinogens. There has been nothing to indicate that PG or VG is carcinogenic in anyway (both substances are used in medical products and food products).
Now, it's always possible that there is some unknown chemical reaction that PG or VG may have with human lungs... but in 5 years of people vaping no one has seen any evidence of it. In fact the opposite... everyone reports their lung function increasing substantially.
It's impossible to prove a negative... you can't prove vape is 100% safe... because that can only be proven after 20 years and no one getting sick. But there's no scientific reason to believe that it will cause harm long term.
Not vaping anything is obviously the 100% safest route.
But compared to smoking, vaping is WAY less harmful to your lungs.
Tell your dad to think of it like when you are cooking. When you do a stir fry and the steam comes off the pan... that 'vapor' is not just water, it's from the oil you're using, the spices, etc... but no one freaks out and thinks 'omg is the steam from my stir fry going to ruin my lungs?' ... of course not.
IF vaping where screwing up peoples lungs, people would be coughing the way they do when they smoke as the body attempted to get rid of the build up of particulate matter. (note: not coughing while inhaling... but coughing when not vaping... the way smokers do).'