Can smoking Marijuana decrease chances of conceiving?

This is my first time making a post so please bear with me.. My fiance and I have been ttc for the past 6 months, I already have a beautiful 4 year old daughter but so ready for baby #2. He smokes but I don't, we have been having a debate about him smoking because I feel that my chances on conceiving are low because he smokes, but he thinks different.. So please if anyone have any suggestions please let me know or any input on this situation... 😭😭😭