Totally weird question

Ok so my husband chews tobacco. He's been doing it for years. I have no problem with him doing it as that is his choice and cannot change his opinion about it so no need to give me your opinions on that part but anyway, we have sex quite a bit a he ejaculates in me every time. I'm now 36 weeks and we've been doing his ever since we found out I was pregnant. I'm just wondering if his semen could contain any smokeless tobacco in it and harm our baby? I know such a weird question but I heard that men who chew could affect their sperm but didn't know if it could get to baby in any way. Would love so feedback and please don't be negative thank you