Hello Roger, and thank you for posting,

I am sorry to learn that your daughter has stage 4 cancer and is going through cancer treatment. This must not be easy for you as a family.

It can take 24 hours for nicotine to leave the body after stopping smoking, and after 72 hours, the carbon monoxide levels drop to the same level as a non-smoker. There is more information about what happens to the body when someone stops smoking on the

NHS Better Health Quit Smoking article.

If this is something that your daughter wants to do, there is support, such as stop smoking services, and there is an array of tools that can help, such as nicotine replacement therapy and prescription medicines. We have more detailed information on how to stop smoking.

I hope this helps in some way. If you would like to speak with one of our nurses on the helpline, we are available between 9am and 5pm Monday to Friday freephone 0808 800 4040.

Jemma