What does vaping do to your lungs?

The harm of e-cigarettes to the lungs is clear and multi-faceted. It can cause inflammation, damage lung tissue, weaken the immune system, and increase the risk of developing various respiratory diseases.
?? How the lungs are damaged: Core mechanism
The aerosol produced by e-cigarettes is not "water vapor". It contains various harmful substances such as nicotine, heavy metals, and carcinogens. These substances can damage the lungs through the following ways:
Triggering inflammation and oxidative stress: This is the core mechanism of damage. E-cigarettes directly stimulate the lungs, causing persistent inflammation and oxidative stress responses. It's as if the lungs are constantly "on fire", and this situation over time can damage the lung tissue.
Damaging pulmonary surfactant: E-cigarettes can damage the surfactant on the surface of alveoli, which is a crucial substance that maintains the normal expansion of alveoli. Its dysfunction leads to more strenuous breathing and an increased risk of alveoli collapse.
Weakening immune defense: E-cigarettes can damage the immune cells and mucus-clearing functions in the lungs, making the lungs more susceptible to viral and bacterial infections.
?? Known risks to lung health
Based on the above mechanisms, the use of electronic cigarettes has been proven to be associated with the following health risks:
Respiratory system symptoms and diseases:
The risk of developing respiratory symptoms such as chronic coughing, wheezing, and shortness of breath has significantly increased.
The risk of developing asthma and chronic obstructive pulmonary disease (COPD) increases.
It may increase the risk of developing pulmonary fibrosis.
EVALI (Electronic Vaping-Related Lung Injury):
This is an acute, severe and potentially fatal lung disease.
The symptoms include shortness of breath, fever, coughing, chest pain, vomiting, diarrhea, etc.
Although the number of EVALI cases decreased after the outbreak in 2019, there were still some recurrence cases recorded. According to data from the US CDC, as of February 2020, a total of 2,807 cases had been reported across the United States, with 60 deaths.
Vitamin E acetate, an additive found in some THC-containing products, has been strongly linked to the outbreak of EVALI.
Harm to specific groups:
Teenagers: Nicotine can harm the developing brain before the age of 25, affecting attention, learning and mood. Teenagers who use e-cigarettes are nearly three times more likely to smoke traditional cigarettes in the future.
Pregnant women and fetuses: Nicotine has harmful effects on the brain and lung development of the fetus.
⚠️ Misconception about "Safer"
Although some studies suggest that the levels of certain carcinogens in e-cigarettes may be lower than those in traditional cigarettes, this does not mean that e-cigarettes are safe.
The risk of dual use is even higher: "Dual users" who use both e-cigarettes and traditional cigarettes have a 20% to 40% higher risk of developing respiratory diseases compared to those who use either product alone.
"Eatable" does not mean "inhalable": Some safe flavoring agents in food (such as diacetyl, associated with "popcorn lung") can cause serious harm to the lungs when inhaled.
?? Summary
In conclusion, e-cigarettes cause substantial harm to the lungs through various mechanisms such as inflammation, destruction of lung surfactant, and weakening of the immune system. They are not harmless and significantly increase the risk of respiratory diseases, and may also trigger acute severe conditions like EVALI.
The World Health Organization (WHO) clearly recommends that the safest option is to neither smoke nor use e-cigarettes.