Partner behaviour is the single strongest external predictor of whether a pregnancy quit attempt sticks. Not clinical care, not app use, not NRT choice. The person she lives with.

If you also use nicotine

The ideal move is to quit with her. The next-best move is to make the shared environment nicotine-free:

  • No vaping in the home, the car, or shared outdoor space.
  • No devices left visible on counters, in bags, or in cars she uses.
  • No smell of e-liquid on your clothes when you come home — change if you have to.

The Cochrane review is unusually blunt on this: partner nicotine use in the same household is one of the strongest predictors of pregnancy-quit relapse, both prenatally and postpartum.

If you're not ready to quit for yourself, quit for the next six months and reassess. Six months is the highest-stakes window; you can revisit your own use after.

The support playbook

Once, up front, ask what kind of support she wants. The three options:

  • Cheerleader. Celebrate milestones — the first appointment where she says "I quit," week 4, delivery day, six weeks postpartum.
  • Hands-off. She knows you know. She'll bring it up if she wants to.
  • Accountability. One gentle check-in a day, no more.

Get the answer. Deliver only that kind of support. See supporting a partner quitting vaping for the general playbook.

First trimester is chemistry

Nausea, hormonal shifts, and nicotine withdrawal at the same time make weeks 6-12 rough. If she snaps, do not escalate. If you snap, apologise and move on. Do not schedule difficult household conversations during this window.

Anticipate postpartum

The relapse window does not end at delivery. It arguably starts there. See postpartum relapse prevention. Sleep-deprived 3am feeds, isolation, and the disappearance of the "for the baby" frame all pull the wrong direction.

What helps postpartum:

  • Take night feeds when you can, so she gets a longer sleep block.
  • Notice and name her milestone dates (birth day, one month, three months quit).
  • Keep the home nicotine-free even after the baby comes.
  • Do not celebrate "you're totally past it" — she isn't, and she knows it.

What backfires

  • Checking her pockets, breath, or hands.
  • Reading her old vape data or asking about specific times.
  • Comparing her to another pregnant person who "quit no problem."
  • Framing your own continued nicotine use as her problem to work around.

See the full list of what not to do.