How can I get my boyfriend to change his mind about no smoking policy?

So, my boyfriend of about a year is in the middle of buying a house - and also not taking on any of my ideas by the way - and when he mentioned a moving-in party, we discussed it and he told me that in no uncertain terms will ANYONE be allowed to smoke on his property, not in the house, not outside - they can go out the front gate.

I don't smoke but a number of my friends, and his friends do, and I think that this rule is overkill, but he's putting his foot down because he REALLY hates smoking, and I'm worried some people won't come if they can't smoke, how can I get him to compromise to at least allow it just for this one party?

Updates
3 mo
Okay, I concede on the smoking part.

But he's told me this also applies to vaping (and all forms of e-cigs) and weed, which is really going too far, especially if we have guests over for a party.
How can I get my boyfriend to change his mind about no smoking policy?
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