Obesity tax?????

I ran across an article in the N.Y. Times the other day on a proposal to tax sugary sodas and juice drinks with less than 70% natural juice. This tax would be on top of the existing sales tax. The part that gets me is that they want to impose an 18% tax. 18%!!!!! New York claims that theyw ill use the money generated from the tax for health programs and hope to cut the obesity rate. Did high taxes on cigarettes work? No. I know I could say more but everything I keep writing just doesn't come across the way I would like it to. Argh...politics.