smelling cigarette smoke and headaches How Odors Can Trigger a Migraine Headache Dear Abby: How can I
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I think 18 is too young, Anatomy & Physiology teacher Kali Gomez said

It produces compounds (anandamide, 2-AG) that bind to CB1 receptors throughout your brain and body, maintaining homeostasis
2010 Jul;8(7):917-32
Psychol Health
Internal exposure occurs when radioactive materials gets inside the body by ingestion (eating, drinking or breathing) or injection (medical procedures)
As the ranks of smokers continued to grow, health organizations became concerned about the health problems associated with cigarette smoking
