Is Swearing a sign of intelligence?

A study shows that those who swear often are frequently highly intelligent:

“The overall finding of this set of studies, that taboo fluency is positively correlated with other measures of verbal
fluency, undermines the [normal] view of swearing”. (http://www.dailymail.co.uk/sciencetech/article-3949986/Is-swearing-sign-intelligence-People-curse-larger-vocabulary-don-t.html).

I am no plaster saint and will use the odd expletive from time to time. It is, however almost always under my breath...