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Another factor that changes DNA methylation is our behavior and the environment to which we are exposed

Smoking is still the primary, causal risk factor leading to COPD, but environmental exposures, such as exposure to biomass fuel combustion, air pollution, and occupational exposures, and poor lung development (both pre- and post-natal) are increasingly recognized as important causes of COPD [3, 12]

That led me to work with Truth Initiative and develop Spanish-language content and experiences for the EX Program

Soldiers in the trenches relied on matches and lighters for various purposes, from lighting cigarettes to igniting stoves for cooking