I presume you mean, why are teenagers addicted to gadgets.
It comes from priming them when they were children, the manufacturing companies bombarded them with advertising at an impressionable age. What was the Jesuit saying, something like, 'give me a child under seven and I will give you a good Christian for life.' People are now hard wired into succumbing to advertising, we often hear, or say ourselves, sentences that are based on advertising jingles or catch phrases. The advertising industry is so big because it works, and it works because all of us allow it to work, we've stopped thinking.