Most sports where participants could materially benefit from helmet use absolutely do discuss helmets though usage varies from common (e.g. recreational downhill skiing) to almost universal--whitewater kayaking.

Downhill skiing in particular has transition from essential no non-racers wearing a helmet to quite a high percentage in maybe a couple of decades.

In 2009, a German state governor caused a terrible skiing accident, which he survived but the victim didn't. He was wearing a helmet, she wasn't, and after that point, helmet sales in Germany and Austria shot through the roof and use has remained high. Before that, it was pretty much only racers and children.

Natasha Richardson (reasonably well-known actress) also died the same year from a skiing-related brain bleed. And yeah, while I haven't had a lot of visibility into ski area helmet usage over the past decade, that does seem to be around the time when it really shot up.