real chewing tobacco use still high among airmen, surgeon general says Chewing Tobacco Guide: History, Types

Seeing as Tara is a medical professional (and a very practical person in general) and the fact that she and Jax had a surprise pregnancy, its safe to assume that they were regularly unprotected

This highly toxic metal causes oxidative damage to various biomolecules in the body

Conditioning of drug-induced physiological responses

The explosive growth in the number of filter brands during this period was directly connected with an attempt to counter peoples concern about the effects of cigarettes on health: the tobacco companies came up with filters that looked as though they might cut down on the harmfulness of smoking, even though the companies were vehemently denying that any such harmfulness existed

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