In some cases, as with the elderly, pregnant women and children, these older, cheaper drugs may be preferable because they are less likely to have certain side effects.

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These six groups are nursing home residents, people with chronic medical conditions like asthma, the elderly, pregnant women, health care workers, and children from ages 6 months to 2 years, Butler said.

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Secondhand smoke and third-hand smoke -- the toxic residue left behind on walls, carpets, and clothes long after a cigarette is extinguished -- are bad news, especially for children, pregnant women, people with chronic illnesses, and the elderly, Winickoff and his colleagues note.

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