Here's the 'need-to-know' line from a study commissioned by retailers:
A 2007 study by the American Shareholders Association found the average state cigarette
tax rate has more than doubled in the past seven years, from 42 cents to 92 cents a pack. Tobacco tax collections increased only 59 percent over that period. (P. 8)
In other words, the Law of Diminishing Returns is at play; cig-tax increases are only ~49.6% efficacious.
Of course, that also means that when Jim Doyle & Co. promise $Umpty-Millions in 'new revenues' based on their cig-tax increase, you can count on a general tax increase to make up for the deficiency in cig-tax revenues.