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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Drug Alcohol Depend. 2011 Feb 1;116(1-3):102–109. doi: 10.1016/j.drugalcdep.2010.11.026

Figure 1.

Figure 1

Means (±1 SEM) for plasma nicotine (A), HR (B), COHb (C), and systolic BP (D) for active and placebo waterpipe tobacco conditions. The timepoint “45+” refers to the fact that some participants (n=12) smoked longer than the minimum 45 minute bout. Filled symbols indicate a significant difference from baseline and asterisks (*) indicate a significant difference between active and placebo conditions at that timepoint (Tukey’s HSD; P<.05).