Where you get the sources that it will prevent them from trying other illegal drugs I do not know, alchohal would increase the use of other illegal drugs. Kids would party more, and at a party you can't possibly think that alchohal will be the only substance.
Also, when I previously stated the issue about addictive tendencies, I was implying that (although if you are alchohalic you will become addicted anyway) teens addicted at a younger age are less likely to attend college and receive a higher level of education. Those who are 21 are most likely already in college, or will not be attending anyway, catch my drift?
