Smoke wafting from wood fires has long provided a familiar winter smell in many parts of the country -- and, in some cases, a foggy haze that has filled people's lungs with fine particles that can cause coughing and wheezing. Citing health concerns, the Environmental Protection Agency now is pressing ahead with regulations to significantly limit the pollution from newly manufactured residential wood heaters. But some of the states with the most wood smoke -- including Minnesota and Wisconsin -- are refusing to go along, claiming that the EPA's new rules could leave low-income residents in the cold. Missouri and...