Not on hand, but you are right to ask for them. I'll further articulate the argument that I should have made above. The demographics of smokers skew towards higher consumption in poorer & less educated brackets while less consumption among wealthier & more educated.

My argument is simple. Taxation has a minimal effect on our behaviors, but our level of education & level of wealth has a much larger effect. Those who are more impacted by a tax on tobacco make up a larger percentage of those who are less impacted by the higher cost.

Source: http://www.cdc.gov/tobacco/data_statistics/fact_sheets/adult...

*Edited for clarity & for a less glib response.