In my opinion, setting the alcohol/nicotine age to 21 isn't so much to prevent 18 year olds from accessing it, its to prevent 14-16 year olds from access. Every

In my opinion, setting the alcohol/nicotine age to 21 isn't so much to prevent 18 year olds from accessing it, its to prevent 14-16 year olds from access. Every high school has some 18 year olds - products legally available to them will trickle down to younger kids much easier than those that require purchasers to be 21.