Well it's a side effect of weed, especially when you cross the limit you usualy don't cross. It's hypothermia which lead to shivering and coldness of the hands and, by extension, to all your skin. Not everybody feels it the same way. I noticed that my friends who do not feel that are the most in shape. Those who are less in shape are more likely to feel that. It's no scientific proof, but could be possible. When you smoke your weed, the bad high will eventually fade within 10-15 minutes, but when you're eating your weed, it may be longer and not pleasant.