Personally, I wouldn't be surprised if the people who oppose this are afraid it will lead to a rash of literate spiders. Laurence says it perfectly:
Not the book, but the drug. Florida may legalize a marijuana extract known as “Charlotte’s Web” because it can dramatically reduce seizures in children with a rare form of epilepsy. However, “some Republican lawmakers are concerned that support for Charlotte’s Web could be confused with support for a medical marijuana proposal on the ballot in November.” This is because “some Republicans” in the Florida legislature are enemies of freedom. Because it has such a small amount of THC, users of Charlotte’s Web don’t get high. Well, what if users do get high? What business is that of the state of Florida? Why is it that in Florida you can buy a bottle of booze and sit at home alone and drink the whole thing and get totally wasted out of your mind and no cop or politician cares a whit, but if you buy a joint and sit at home alone and smoke it they want you to lock you up in a cage? Cursed be the drug war and cursed be those who fund it in the legislature and enforce it on the streets.