Will the prayer of one who prays while knowing that he will consume hashish afterward be accepted, especially since he delays his consumption until after the 'Isha prayer to complete his obligatory duties? And is he sinful if he abandons prayer entirely as long as he consumes hashish, or should he continue to pray and hope for guidance?

Hashish is among the gravest of abominations because it intoxicates its consumer, leads to effeminacy, and corrupts one's temperament. Its harm, in some respects, is greater than that of alcohol. The prescribed punishment (hadd) is obligatory for it, and the prayers of its consumer are not accepted for forty days. Abandoning prayer is a greater sin than consuming hashish, so combining the two evils of consuming hashish and abandoning prayer is more severe and graver.