Tenant possibly smoking

[Max Hutchinson]

Hello newbie here!

I have a duplex where I live in one side and rent out the other. It’s my first rental, and my tenants are a really nice respectful young couple with a baby. Where half way through the lease (year lease) and I just started smelling what smells like cigarette smoke (although I could be mistaken) in the shared utility room and it’s starting to come over a little bit through my side. They have a baby so I really can’t see them smoking in there, it’s not a big duplex either. My question is how should I go about asking them if they are for sure without making them mad or getting upset for me thinking they are when they aren’t and it’s just something there cooking. Like how should I word it or go about it? Also rookie mistake, my first lease I didn’t put no smoking in there. I know terrible mistake, but can’t I say I’d prefer if you guys don’t if they are smoking? But first I have to make sure they are.

Greatly appreciate any help thanks!!