<qa>  What was the smoking cessation protocol in routine primary care?A controlled study demonstrated that a smoking cessation protocol in routine primary care, specifically targeted at patients with COPD SMOCC, doubled the quit rates. The protocol was tested under optimal trial conditions, but it is unclear if a large-scale implementation strategy is cost-effective. Therefore the present study investigates a large scale implementation strategy in a 2-armed community intervention trial. The research question is how cost-effective this implementation strategy is compared to usual implementation procedures. 