What is the fine-grained topic of the following text: Apply a Nicotinell ® Patch 21mg to a cool, clean, hair free part of the body and replace every 24 hours.... Nicotine residues in the used patches may present a hazard to children and pets, thus used patches should be folded, sticky sides together, put back in an empty pouch and placed in household rubbish. Only return the topic.
Proper usage and disposal of Nicotinell® Patch 21mg