Do not send your grandson any info from that list of “marijuana is evil” articles.
From his point of view it is going to have the opposite effect. Just like that movie, “Reefer Madness”. (a ridiculous movie on the evils and horrors of pot)
He probably knows many classmates who use pot only occasionally, and are doing quite well.
If he is a bright and stable young man, he will already know not to abuse any substance.
If you open up a facebook account you can link right from here.
http://www.facebook.com/group.php?gid=322308606937