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. Author manuscript; available in PMC: 2011 Jun 23.
Published in final edited form as: Pulm Pharmacol Ther. 2008 Dec 7;22(2):82–89. doi: 10.1016/j.pupt.2008.11.013

Fig. 6.

Fig. 6

Relationship between the average number of expulsive events and the average urge-to-cough ratings before (closed squares) and after (open circles) placebo gum administration in the NS (top) and SM (middle) groups, and following nicotine gum administration in the SM group (bottom). For every incremental increase in the urge-to-cough ratings, approximately one expulsive event was produced. There were no differences in this relationship (i.e. slope) between groups (SM vs NS) or treatment (nicotine vs placebo).