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Tobacco - World Health Organization (WHO)
What is thirdhand smoke, and why is it a concern? - Mayo Clinic
Nicotine dependence - Symptoms and causes - Mayo Clinic
Tobacco in China - World Health Organization (WHO)
COPD - Symptoms and causes - Mayo Clinic
Cigar smoking: Safer than cigarette smoking? - Mayo Clinic
Phantosmia: What causes olfactory hallucinations? - Mayo Clinic
Quitting smoking: 10 ways to resist tobacco cravings
Tobacco - World Health Organization (WHO)
Hookah smoking: Is it safer than cigarette smoking?