husband is quiting smoking and it's driving me crazy!

My husband is quiting smoking after 10 years and I'm pregnant with our second child (due in November). He thinks I'm not being supportive enough because everytime he craves a smoke he starts to act like a jackass and I'll tell him it's not fair because I'm not the one that got him addicted to cigarettes. He'll complain about something ridiculous and then I'll start to get all hormonal and cry about it. It's just not working out for us at all. He's going to the gym everyday to get his mind off smoking but our relationship is very rocky right now 😩 To top it all off, my SUPER OVERWHELMING SUPER NEEDY in laws announced they were coming to visit us in August from overseas without asking us our plans so we're fighting about that as well. My husband can't say no to his parents. They plan visits whenever they want to.. four times a year.. 1-1.5 weeks.. which feels like a lifetime because I cant stand them! Especially not now that I'm pregnant. Theyre a bunch of slobs and never help out around the house. They think our house is theirs.. I even got rid of our guestbed but that won't stop them. Just felt like I needed to vent.