Sarah Palin Smoked Legal Marijuana, Why Can't You?

You can. Go to Alaska just like she did.
P.S. If she was really some kind of anti-cannabis nazi, she could have done something about it if she wanted to. Her fundamental belief that the government should have less to do with you than more is what likely was behind her not taking any significant action against the current laws in Alaska.
I would think.
Just a thought.