Less than 6% of teens still smoke. That's less than the number of landlines still in use.
Johnston, L. D., O’Malley, P. M., Miech, R. A., Bachman, J. G., & Schulenberg, J. E. (2015). Monitoring the Future national results on drug use: 1975-2015: Overview, Key Findings on Adolescent Drug Use. Ann Arbor: Institute for Social Research, The University of Michigan.
In 2008, 48.8% of people for whom their high school diploma was their highest level of educational attainment who have ever smoked reported that they had successfully quit.
"Cigarette Smoking Among Adults and Trends in Smoking Cessation --- United States, 2008." CDC. Atlanta, GA. 58(44). 13 Nov. 2009: 1227-1232. Web.