A new study now suggests that vaping could cause the same deadly diseases such as smoking.
E-cigarettes appear to trigger the same responses in the body, that can lead to various diseases including asthma and inflammatory lung diseases.
The study was conducted at the University of North Carolina Chapel Hill and researchers believe theirs is the first piece of research to use actual samples of human airways to explore the potential harmful effects of e-cigarettes.
According to Dr Mehmet Kesimer, an associate professor of pathology there is confusion about whether e-cigarettes are 'safer' than cigarettes because the potential adverse effects are only beginning to be studied.
He went on to add that their results suggested that e-cigarettes might just be as bad as cigarettes."
Tests have shown e-cigarettes could be as bad for your heart as fags, causing damage to key blood vessels.
The new study found e-cigarette users had significantly higher levels of proteins in their airways that are linked to chronic obstructive pulmonary disease and cystic fibrosis.
And the same proteins have also been linked to cell death in the tissues lining the blood vessels and organs.
The study's authors note more research is needed to see if this increase of proteins could be linked to diseases including lupus, vasculitis and psoriasis.
They also found vaping causes some of the same negative results as cigarettes with both smokers and vapers having significant increases of mucus secretions linked to chronic bronchitis, asthma and wheeze.
The new findings are published in the American Thoracic Society's American Journal of Respiratory and Critical Care Medicine....