is correct. There is a link to the NCI web site from the smoking section of the CDC website. It doesn't explain how it got the 440K figure, but I bet that it doesn't show up on the list because most of the deaths fall under other categories, such as cancer, because smoking isn't the disease it is the delivery mechanism.
[link|http://www.cancer.gov/cancertopics/tobacco/statisticssnapshot|NCI]