Per my reference no & no. (NC) Most states do not require a casual connection/relationship between material misrepresentation & cause of death.
However, having said that, it is noted that it is hard to say if the case went to court, what any "individual" court might decide after a review of all info. "Generally" the life ins. co. wins. (can rescind) -- except in the states that do require a casual relationship between material misrep. & cause of death & there isn't one.