Answers all the given parts with proper explanations?

7. Consider the following figure from "Comparison of Puff Volume With Cigarettes per Day in Predicting Nicotine Uptake Among Daily Smokers" (Nicolle M. Krebs et al. Am. J. Epidemiol. 2016:184:48-57): Aj 30.0- 10.0- 0.00700 - 22.5- 15.0 manag-3"-Hydroxycolinine, nomL 7.5- 5.10 Total Salivary Nicotine Metabolites, moll 0.00625 Catinine, ngimL 7.5- 0.00175- 0.0 D.D 0.00000 Light-to-Moderate Heavy Light-to-Modorain Heavy Light-to-Moderate Hoary Type of Smoker Type of Smoker Type of Smoker DI 10.0 - 500- 715 375 Total Daily Pulls 5.0 - 250- 2.5- Total Daily Put Volume, ml 125 0.0 O- Light-to-Moderate Heavy Light-to-Moderate Heavy Type of Smoker Type of Smoker Figure 3. Per-cigarette levels of cotinine (A), trans-3'-hydroxyootinine (B), total nicotine metabolites (C), average total daily puffs (D), and average total daily puff volume (E) for light-to moderate (