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Protonated nicotine (NicH+) concentration as a function of pH in E-liquids of Blu and JUUL based on Henderson-Hasselbalch equation. Unprotonated nicotine (Nic) concentration is the difference between total nicotine and NicH+ concentrations at each pH. Note that at pH = pKa of nicotine = 7.89, [NicH+] = [Nic].
