Ah, whelp. I forgot that high school is 9th-12th grade.
Re-reading the high school numbers cigarettes are down 15.8% -> 8.0% (2011-2016) but eCigs are up 1.5% -> 11.3% (2011-2016).
The gains in eCig usage still appear to cancel out the reduction in cigarette usage ("(20.2%) reported current use of some type of tobacco product"). But definitely a less dramatic effect than I originally claimed.
