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In the old days everyone smoked

Your vet may ask you some questions like: Does your dog have trouble breathing between coughing fits

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However, we do not yet know how vapes affect your health when pregnant or the health of babies as they grow in the womb

Instead, they stated that [s]moking was adjusted for by using a current smoking dose variable [none, 10 cigarettes per day] as well as a pack-year variable [never, 33 pack-years]. But this created a major problem: the 504 former smokers were combined with the 335 never smokers in the current smoking dose variable, and they were combined with the 237 current smokers in the pack-years of smoking variable (Table 1, Column labeled Total Sample)