美国马萨诸塞州职业保健中心温特斯博士认为烟中含有大量放射物。麻省大学医疗中心研究员分析每天抽一包半的吸烟者,每年肺部受到的射线,相当于300次胸部X光透视。现已发现烟中放射性同位素的危害极大。美农业部研究员把烟中的放射素追溯到栽种地。几十年来农民给烟草地施入含大量铀的磷肥,腐烂后产生镭—226,反之,出现氡—222。最后产 Winters, occupational health center of Massachusetts, USA, thinks there is a lot of radioactivity in the smoke. Researchers at the University of Massachusetts Medical Center analyzed smoking a pack of half a day smokers, each received by the lungs of the ray, equivalent to 300 chest X-ray. It has been found that the radioactive isotopes in smoke are extremely harmful. Researchers at the U.S. Department of Agriculture traced the radioactivity in the tobacco to planting sites. For decades, peasants applied a large amount of phosphate fertilizer containing uranium to tobacco and produced radium-226 after decay. On the contrary, radon-222 appeared. The final product