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Proven and plausible environmental carcinogens could be physical (ionizing and non-ionizing radiation), chemicals (such as asbestos, formaldehyde, and dioxins), and heavy metals (such as cobalt, arsenic, cadmium, chromium, and nickel)

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But one of the most important technologies in air purification is actually a material that dates back thousands of years: charcoal, in the modern sense, activated charcoal

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Reflecting on the experience, he added: I learned two things, smoking is something we can unlearn, and it only takes a small action to begin. For Vivaswan, a 33-year-old teacher and writer, the decision to quit came after watching his father struggle with a smoking-related illness