Radon, the naturally occuring radioactive gas found in the ground to varying degrees, is known to cause cancer, and yet experts say public knowledge of the health risk is too low. The risk in homes and workplaces, above all, is not understood well enough, Germany’s Federal Office for Radiation Protection (BfS) is warning, after research found little of the public in the country understood the danger. “Radon is one of the most frequent causes of lung cancer after smoking against which you can protect yourself,” said BfS President Inge Paulini. Radon can occur in any building and increase the ri…