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. Author manuscript; available in PMC: 2016 Aug 3.
Published in final edited form as: Drug Alcohol Depend. 2015 May 18;153:271–277. doi: 10.1016/j.drugalcdep.2015.05.007

Figure 2.

Figure 2

Graphic used to provide “Lung Age” feedback used in the study. Adapted from Fletcher, BMJ 1977; Kohansal, Am J Resp Crit Care Med 2009; and Scanlon, Am J Resp Crit Care Med 2000.