What are some potential dangers of wearing rubber wrist bands?

Rubber wrist bands can be harmful especially if they get caught on something, if the user were to go unnoticed of this they could break their band or hurt themselves. They can also be dangerous if you have a friend that would want to snap them towards your skin. They could also be dangerous because of the chemicals they are composed of. We may not know the long term effects yet from different types of chemicals; within the next few decades more information will be presented.