The UK government agencies opinion is that e-cigarettes are about 1/20th the risk of smoking. So if 1% of teens switch from smoking to vaping and 19% of teens

The UK government agencies opinion is that e-cigarettes are about 1/20th the risk of smoking. So if 1% of teens switch from smoking to vaping and 19% of teens start vaping it's a wash from a public health standpoint. And the numbers are far better than this which means it's a public health benefit.