Will life insurance exams test for marijuana?

I'm about to get life insurance and they want to do blood work and urinalysis. I'm an occasional pot smoker and I'm not sure if I should be concerned about that or not. I know there aren't any legal repercussions but my wife thinks they could deny me coverage and put me on some kind of list so I can't ever get life insurance.I just want to know if I need to quit smoking pot and put the test off