Fact
Less than 6% of teens still smoke. That's less than the number of landlines still in use.
Source 1:
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.
http://monitoringthefuture.org/pressreleases/15Edrtbl.pdf#page=44
Source 2:
CIA World Factbook
https://www.cia.gov/the-world-factbook/field/telephones-fixed-lines/