[toast0]

You can certainly reduce smoking to see if lung capacity improves. I don't think it's reasonable to reduce smoking to see if that will cause an existing tumor to go into remission, for the same reason it's not reasonable to see if installing a blade guard on a saw will make a amputated finger reattach or regrow. The risk has manifested, and removing the risk factor is too late.

You'd need a large study to determine if stopping smoking reduces future risk of tumors; it's not something you can determine in a single person.

[giantg2]

"You'd need a large study to determine if stopping smoking reduces future risk of tumors; it's not something you can determine in a single person."

And they have done some studies that seem to prove the risk does decrease after cessation and continues to decrease over time.