How Much of a Distraction is a Smart Watch?

With the recent release of the popular apple watch it leaves the question of what should the smart watch be classified as by law. Recently a Canadian man was fined 120$ for using his apple watch while driving under the pretense that it was a handheld electronic with a cell phone function. This case leaves the question, should people be able to use smart watches while driving or are they a distraction similar to cell phone usage?

I don't own a smart watch myself, but having used one I don't think I could drive while looking at the watch screen for its "smart" functions. That being said, the watch can just be used as a normal watch face to tell time so there is a large grey area. I think because of this ambiguity the law regarding smart watches should be based on what function the watch is serving. If apple introduced a driving mode where the watch logged past actions then a police officer could see the log and base his or her decision on this log. This limit could keep drivers from being distracted by watches, but at the same time let them use the non-distracting functions and not be ticketed for them. How do you think driving and using a smart watch should be monitored by police?