In Sweden, where many adults use snus (moist oral tobacco), we see evidence that nicotine itself has low harm potential. Sweden has the lowest rates of smoking-related disease in the western world. Population-level studies show beyond a doubt that long-term snus use carries almost no risk at all. Likewise, even the FDA admits that long term use of nicotine replacement therapy (NRT) products like nicotine gum and patches are not dangerous — or even likely to be addictive.
The bottom line is that smoking is very, very bad for you, and any nicotine product that eliminates the known dangers of breathing in combusted plant material can only be a vast improvement. We know that smoking causes cancer, heart disease, and severe lung damage. There is no evidence that vaping causes any serious health problems.
As of now, the scientific consensus is that vaping is probably not bad for you. And if the alternative is smoking cigarettes, it’s a much better choice.