Per-capita cigarette consumption in the United States has declined precipitously since the 1960s. The numbers in the United States are collapsing, and the decline shows no sign of abating -- which is why tobacco companies are aiming at second- and third-world countries.
While I don't disagree that cigarette smoking has declined - I don't believe the decline is quite as precipitous as that indicates.
Many people are finding other sources which would not be included in that chart. With those estimates coming from the Department of Ag - I would venture much of it is based upon how much is sold to the cigarette manufacturers........not sure if it includes tobacco produced for other things such as loose, nor does it account for the numbers of folks who have started growing it themselves.