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They found that vapers were more than three times as likely to have begun smoking cigarettes by the next year compared with never smokers. In mid-June, the CDC released data about e-cigarette use among working adults, showing that about 5.5 million Americans use the devices but also tend to continue to smoke conventional tobacco products
3b and Extended Data Fig
Respiratory Irritation Even without nicotine, the inhalation of vaporized substances can irritate the respiratory system or cause lung disease
Studies have found that drugs modulating acetylcholine receptors can induce manic episodes, suggesting that acetylcholine receptors may exhibit different functional patterns or expression levels in the brains of patients with bipolar disorder 25
Amphetamines These stimulants are commonly prescribed to treat ADHD and narcolepsy, and work by increasing energy and concentration
As the Mayas moved north, through Central America and into North America, tobacco use spread throughout the continent
