How long is it safe to drag down lungfuls of cold air?

[PenttitheFinn]

They'd laugh would they? I'm not sure they'd find it funny, seeing as shovelling show is one of the most common causes of heart attacks in Finland...

http://www.bbc.co.uk/news/blogs-news-from-elsewhere-35484237

I am sure they are aware, but they would still laugh. As far as I know none of them have an oversize shovel which is what the article is about.

 

[andrew_s]

How cold does it need to be before I should consider some sort of protection - if any?

About -30°C
Excessive heavy breathing at colder than that can leave you coughing for a couple of weeks.