about lung cancer related to secondhand smoke?

[gavinol]

If someone is exposed to secondhand smoke often and doesn't have lung cancer, but starts to show early signs of it, then will it save them if they cut off/reduce their exposure to secondhand smoke before the cancer actually develops? Or is it too late?

[Dr. Joshua]

I'm not sure what you mean by "early signs" of lung cancer. If a cancer has developed, then reducing exposure to smoke will no longer have any effect.

Generally, reducing second hand smoke exposure is important and will reduce the risk of developing diseases caused by smoking.