There are so many risks involved with smoking yet people still do it. This addiction can lead to several diseases such as cancer of the throat and mouth, emphysema, and myeloid leukemia. This insidious disease is a fast moving and fast growing cancer that affects the bone marrow and the blood. It is rare and often isn't caught until later stages because the symptoms are similar to other illnesses, including the flu. After diagnosis, treatment often includes chemotherapy and perhaps a stem cell transplant. Neither methods are pleasant and both often require long bouts of hospitalization.
If you want information on the effects of what's actually within the liquid cartridges in e-cigarettes, the area is still a little unclear. There haven't been too many studies on these devices, but researchers from a study associated with the U.S National Institute of Health have warned that teens who use them are at higher risk to becoming addicted to nicotine. And while the e-cigarettes may not have all of the other cancer causing chemicals in them, they certainly do have nicotine - and that's certainly just one danger of cigarettes.
Basically the only real way to avoid illness associated from nicotine use is to avoid it altogether. "Smoking" an e-cig or vapor cigarette still allows for a risk of disease and serious illness. The only real way to to cut the number of deaths associated with tobacco use is to just never start smoking at all, no matter if it's regular cigarettes or e-cigarettes. However, if you must smoke, it may be beneficial to switch to e-cigarettes to help you kick the habit and/or to lower your risk of developing some diseases. It is a risk that only you know for sure if you want to take - just be sure to be an informed consumer.