A bubble pipe is a toy

Toy

A toy is any object that can be used for play. Toys are associated commonly with children and pets. Playing with toys is often thought to be an enjoyable means of training the young for life in human society. Different materials are used to make toys enjoyable and cuddly to both young and old...

 shaped like a tobacco pipe, intended to be used for blowing soap bubbles. Most bubble pipes are made of plastic

Plastic

A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs...

 and therefore cannot be used for actual smoking

Tobacco smoking

Tobacco smoking is the practice where tobacco is burned and the resulting smoke is inhaled. The practice may have begun as early as 5000–3000 BCE. Tobacco was introduced to Eurasia in the late 16th century where it followed common trade routes...

. They are usually brightly colored, and sometimes feature fanciful designs including multiple bowls.

Like candy cigarettes, bubble pipes allow children to imitate adult smokers. As concern over the harmful effects of tobacco smoke and the marketing of smoking products to children has risen, both have become considerably less popular.