Is there alternative medicine to repair lung damage from smoking?

Unlikely. Cigarette smoking can cause lung damage from day 1. Stopping today, however, can help to reverse damage caused by smoking; and after 6 months of no smoking, studies have shown that your heart-attack risk can revert to that of a non-smoker!
Meds ? You have a natural clean up mechanism in the lung that can mobilize dust particles and debris from smoking. The lung tissue has a potential for lots of recovery, within limits. If you've used it as an ash collector from smoking for years there will be residual issues. We can selectively treat some specific lung issues but there is no "recovery med"