Eli5: How bad is tanning really?

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Over the years I have heard from countless sources that tanning (indoor especially) is incredibly dangerous. I know that it increases your risk of skin cancers and other skin damage, early aging, etc but I am having trouble explaining to my partner the severity of the damage. I am bad with words. Can someone please eli5 the reality of it so I can get him to stop tanning? Thank you!

In: Chemistry