Lung cancer is known to be caused by carcinogens in smoke, vapor is not smoke, you cannot simply transfer the ills of smoking to vaping just because.
Nicotine alone is not harmful, it's addictive, but not harmful, it's not what causes cancer from smoking.
All apparent evidence is that vaping appears vastly healthier than smoking and there's no reason yet to believe vapor is harmful to the lungs; you breath water vapor all day every day. Calling something "foreign chemicals" might sound scary, but is not a plausible reason to call something definitely unhealthy. The word definitely is very bold, and not remotely justified.
> People run around vaping like there are zero consequences
No, they run around like it's vastly safer than smoking, which it clearly is. There's zero evidence anything to do with vaping has the cancer causing effects of smoke and burnt carcinogens.