Is it permissible to pray for someone who died due to smoking?

A smoker is not considered a suicide if he dies due to smoking; rather, he is disobedient for consuming something harmful to his body. A disobedient person, as long as he remains within the fold of Islam, is prayed over if he dies, unless he deems intoxicants permissible or completely abandons prayer. Muslims pray the funeral prayer over him, and he is treated as other deceased Muslims, even if he committed suicide, for withholding the prayer from him is for deterrence and admonition.