Even at today's high prices it would take about 11 years of Mom and Dad each smoking one pack per day to spend one year's average college tuition on tobacco. I think you've just put forth the weakest argument for anything ever made on FR.
Ok. Smokes are $3.50 in my neck of the woods. 2 packs a day for 10 years is roughly $25K if you wold just stick it in the mattress. Half of that if only one spouse smokes. If you factor in compound interest and the benefits of contributing to tax free or tax deferred programs, the amount is significantly more.
People that roll their own could still save a dollar day..