The number of cigarette smokers in the United States has dropped by 8.6 million since 2005.

Those numbers may fall more with new state tax increases on cigarettes.

The Centers for Disease Control and Prevention says smoking rates have fallen six percent from 21 percent of the adult population in 2005 to 15 percent in 2015. The smoking rate fell by 1.7 percentage points between 2014 and 2015 alone.

There is a federal tax on cigarettes, but states can also tax cigarettes, just as California did on Election Day.

California voters approved a $2 per pack tax increase.  Smoking rates decrease as the price of cigarettes goes up, and the decrease in smoking rate is seen most in child and teen smokers.