What is the ruling regarding a wife remaining with a husband who smokes and stockpiles khat, and prays most of his obligatory prayers at home despite the availability of mosques? And what are her duties towards him?

The wife is advised to continue gently counseling her husband, who smokes and is addicted to khat. If he does not respond, she has the option to either be patient or seek a divorce, especially since the unpleasant smell of smoking may permit her to do so, as some jurists consider bad breath a defect that allows for the annulment of marriage. As for his abandonment of prayer in the mosque, it is not considered a valid reason for divorce as long as he prays, but he should be advised to pray in the mosque, and she should supplicate for him and seek help from those who have influence over him.