Most advice for supporting someone who is quitting assumes you do not smoke. If you do, you are in a stranger position than that advice accounts for, and pretending otherwise helps nobody.
Let us start with the part that usually goes unsaid: you may not be entirely pleased about this. Smoking together is a shared activity, often one of the few reliable ones — the step outside, the two minutes on the back step, the conversation that happens there and nowhere else. Your partner quitting removes that, and it also puts an unspoken question over your own smoking that was not there last week. Feeling defensive, or a bit abandoned, or quietly resentful, does not make you a bad partner. It makes you someone whose situation genuinely changed without being consulted. You will handle the next month better if you have admitted that to yourself rather than performing enthusiasm over the top of it.
Now the practical part, which comes down to a handful of things that make a measurable difference.
Do not smoke in the house or the car, from day one, without being asked. This is the single largest thing you can do. Secondhand smoke aside, the smell is a potent cue, and a partner who is two weeks in and walks into a room that smells of cigarettes is being handed a craving they did not go looking for. If that means standing outside in poor weather for a few weeks, that is the cost, and it is not a large one relative to what they are attempting.
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Keep your cigarettes and lighters out of sight and out of shared spaces. Not hidden in a way that feels furtive, just not on the kitchen table. The clear-out they did on quit day loses most of its value if there is a packet sitting in the fruit bowl.
Never offer, and think carefully about the moment they ask. They may well ask, at some point, probably during an argument or after a bad day. The honest thing is to have decided in advance what you will do, because deciding in the moment goes badly. Most people who have been through this land on some version of: I am not going to be the one who hands it to you. That is a reasonable line and it is kinder than it sounds.
Do not make your smoking into a performance in either direction. Announcing every time you go out for one draws attention to it. Sneaking around and coming back smelling of smoke while claiming you did not is worse, because it introduces a small dishonesty into something they are already finding difficult. Just go, and come back, and do not make it an event.
Expect the mood, and try not to take it personally when it arrives. Irritability is a genuine withdrawal symptom with a timeline, usually worst in the first two weeks. It is aimed at the world rather than at you, even when it lands on you. The useful response is not to match it.
Then the question you are probably avoiding, which is whether you should quit too. The evidence is not subtle here: couples who quit together do better than either does alone, and someone whose partner smokes is significantly more likely to relapse. That is a real finding and you deserve to know it. But quitting because you have been made to feel guilty rarely works, and a resentful quit is usually a short one. If you are not ready, you are not ready, and the better move is the one above — make your smoking as invisible and as unavailable to them as you can — rather than a half-hearted attempt that fails in a fortnight and quietly gives them permission to fail too.
What you should not do is treat their quit as a temporary phase that will pass and restore normal service. It might not. If it holds, the shared back-step conversation is gone and something else has to take its place, and that is worth thinking about now rather than discovering by absence. Find a different two minutes. It sounds small. It is the part most couples miss.