尽管医生建议他戒烟，但他的固执让他继续每天抽两包烟。

Despite the doctor's advice to quit smoking, his ___obstinacy made him continue smoking two packs a day.

尽管医生多次解释吸烟的危害，他的固执使他仍然拒绝戒烟。

Despite the doctor's repeated explanations about the dangers of smoking, his ___obstinacy made him refuse to quit.