Norway's ban on indoor smoking in all public places goes into effect Tuesday. Norwegian smokers are still allowed to light up outdoors. And as summer approaches in Scandinavia, sidewalk cafes are likely to attract smokers. But Norway's cold winters make that option much less attractive, especially in the northern-most part of the country, on the Arctic island of Svalbard, where even summer temperatures rarely rise above freezing. Lars Bevanger reports for the BBC.