应该是it is believed吧?
意译：吸烟,据（人们）认为,是因癌症而死亡的所有人数中三成的死因.
it is believed为句子的独立成分,视为插入语.
分析简单句子smoking,it is believe ,is responsible for 30 per cent
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分析简单句子smoking,it is believe ,is responsible for 30 per cent
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it is responsible for any damage or breakage of products cau