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[17] The carbon monoxide tolerance level for any person is altered by several factors, including genetics (hemoglobin mutations), behavior such as activity level, rate of ventilation, a pre-existing cerebral or cardiovascular disease, cardiac output, anemia, sickle cell disease and other hematological disorders, geography and barometric pressure, and metabolic rate

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Smoke from one hour of hookah equal to 150 cigarettes New research shows that in a one-hour hookah smoking session users inhale as much smoke as someone puffing on 150 cigarettes

Preterm infants with BPD who are exposed to second-hand smoke have been found to require supplemental oxygen for longer periods of time and to be more likely to require steroid treatment as neonates (Collaco et al., 2014