The good? The possibilities of smartphones are just awesome. It is amazing to be in touch with people all over the world. And all this huge knowledge .. avaiable in an blink. Who does even remember how it was to not be able to google just something you want to know? You needed to have books, or know expert people, or people to know which book to read. And now? Just go online and if you know how, you will find your information. Or get your amusement, your news, your need to be acnowledged.
But all of this is still brand new. So we still have to learn not to get lost in it. Be still aware that you have a physical body with needs and sensations. And people seem to forget, that doing sports or climbing a mountain is something very different, from watching a video about it. But television is even older and there it was only consumption. Now it is interaction - only, and that is sadly a bad part, mostly controlled by coorporations who wants to distract your attention as a buisness modell. Something there got really out of hand and with kids growing up with tailered ads accustomed to data from their whole online activity ever ... than this is where I see the real danger. But kids are allways much smarter than the older generation thinks they are, so I believe they will be doing fine.