Popular alcohol producers had a bumpy morning as investors reacted to an advisory from the U.S. Surgeon General about alcohol and cancer.

Surgeon General Vivek Murthy’s call Friday to require alcohol labels warning of cancer risk will likely face strong resistance in Congress, which would have to pass a law to require the labels. The alcohol industry fiercely opposes labeling as well as stricter guidance around consumption — the government currently recommends men consume no more than two drinks per day and women no more than one — and has cultivated support among lawmakers through an expensive lobbying and political operation.