What it comes down to is an attempt at control and shaping choices. The thought is that if the "kids" can be held off for just a few more years to legally purchase tobacco products, then they may be less likely to start up.
See report Here:
Public Health Implications of Raising the Minimum Age of Legal Access to Tobacco Products
We all know and have seen how unbiased and the solid evidence based science the FDA has used. (sarcasm)

This is just false logic.
Can't say that having an age of 21 to purchase alcoholic beverages has stopped many from consuming later on. A legal drinking age of 21 is at least somewhat understandable due to the consequences of impairment. But 21 for tobacco products? And as stated prior, I think this is being targeted at cigarettes but cigars are just being caught in the net.