Question about my man vaping.

Does it hurt our chances by him doing it? He has 6% nicotine juice and has vaped the whole time we have been together. We’ve been trying for 6 months now with no luck. I have another little boy who is 3 and I am very regular with my cycles. I’m just curious if y’all know anything about any effects on sperm from nicotine. Thank y’all ♥️