every single person you meet...

[wufwugy]

Speaking of vitamin D, it's synthesized from absorbing UV radiation, which is blocked out by sunscreen. Vitamin D deficiency leads to increased rates of cancer (among a myriad of other problems), so you can get a tan, get your vitamin D and get skin cancer, or you can stay protected from the sun and get some other cancer.

Alternatively you could just take supplements I guess...

Interestingly, only a portion of rays are even blocked by sunscreen. IIRC, the ones that cause burns, which in turn can cause premature aging and cancer, are the ones that are blocked by sunscreen. But there are other ones that are at full force throughout the entire day, are not blocked by clouds, and don't cause burns that are the primary source of sun-exposure premature aging and cancer

This may not be entirely correct, just IIRC

[CoccoBill]

Interestingly, only a portion of rays are even blocked by sunscreen. IIRC, the ones that cause burns, which in turn can cause premature aging and cancer, are the ones that are blocked by sunscreen. But there are other ones that are at full force throughout the entire day, are not blocked by clouds, and don't cause burns that are the primary source of sun-exposure premature aging and cancer

This may not be entirely correct, just IIRC

UVA and UVB radiation both cause skin aging and cancer. The SPF rating system measures the ability to block UVB, not UVA. If the sunscreen contains avobenzone, benzophenones or helioplex, it'll also block UVA, at least some of its spectrum. Most sunscreens only block UVB.