Smoking weed

Catrina • 25. Married to my other half. 5-15-15. 1 angel baby named River. Daughter named Remington. Son named Journey.
My husband is a total pot head. Not like the lazy and do nothing kind. He works very hard. 
I know it can affect sperm count. He isn't going to stop and that's not a battle I choose to fight. I am making him start taking zinc to increase sperm.... Is there anything else he can do? 
No judgement please :)