It depends on who is doing it and their source of power. It can be dangerous for the victim and the voodooist. The right person can send it right back at you.
"People with a high tolerance for boredom can get a lot of thinking done." -Stephen King
“For every woman is at heart a witch.” -Charles Leland
“Men argue, nature acts.” -Voltaire
“Our life is the creation of our mind.” -Buddha
“Any person capable of angering you becomes your master.” -Epictetus
“Facts don’t cease to exist because they are ignored.” -Aldous Huxley
Voudon is a path devoted to Caribbean deities called Orishas, and uses a method of lua spirits “riding” the practitioner In ecstatic or entranced dancing.
The doll or poppet is just a tool used in many witchcraft paths. The doll itself is what you make of it. It can be used to hex or heal in any magical practice.
Creating a poppet is another act of focus and coorespondance (making an object and connecting it to the subject) within many branches of sympathetic magic.
Adding hair, nails, a photograph? Just more layers of coorespondance.