Parents don’t need a poll to tell them their teenagers are addicted to smartphones. After all, smartphones are a permanent fixture rather than accessories for kids of all ages these days. Even so, polls move these everyday observances from anecdotal to official problem when the numbers tilt in that direction — and a Common Sense Media poll hit full tilt. The fact that 59 percent of parents said their teens were addicted to mobile devices was not surprising. However, the fact that 50 percent of teens admitted they were addicted was shocking.