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Sources: Anxiety disorders - Symptoms and causes | Mayo Clinic Anxiety Disorders - Facts & Statistics | ADAA Nicotine Addiction: Neurobiology and Mechanism | PMC Nicotine | Tobacco, Addiction, Poison | Britannica Effect of nicotine and nicotinic receptors on anxiety and depression | PCM Nicotine Modulation of Fear Memories and Anxiety | PMC Managing Nicotine Withdrawal | Smokefree

We live in a time when heavy smokers are on the decline nationally and regular daily smoking is down, he notes, but social smoking is increasing and casual smoking is holding steady. What many of these casual smokers may not understand, he says, is the very real possibility of health problems associated with intermittent smoking

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