Jason Sheltzer, a molecular biologist at Cold Spring Harbor Laboratory, in New York state, who is investigating the matter, reckons it possible that nicotine, which interferes with this process, may lessen the damage.这里reckon it possible that是状语从句？

      【答】Jason Sheltzer 是主语， reckons 是谓语动词， it 是形式宾语， possible 是形容词作宾补， that nicotine may lessen the damage 宾语从句，作  reckons 的真正宾语。

       划线部分是非限制性定语从句，修饰  nicotine 。