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Qing Song wrote this manuscript, drew the figures and tables

Historically, from the 1970s, the tobacco industry has conducted pharmacological studies on several nicotine analogs, to understand their pharmacological effects and determine their potential to replace nicotine in products and also to circumvent any foreseeable regulations on nicotine 14

I have so many angry feelings towards him for doing this to himself and our family

This can cause two problems: 1) Because oxygen is vital to preventing and healing infections, when there is less oxygen in the blood due to smoking, infections can get out of control causing gum disease