It may be a new fad in Hong Kong, but the shisha - also called the hookah, hubble-bubble, narghile or just waterpipe - dates back to 16th-century India when pipes were made out of coconut shells. Within a century, as tobacco smoking was spreading throughout the world, the shisha had become firmly established throughout the Middle East and the waterpipe completed its evolution into the shape we know now, according to a World Health Organisation report. Smoking waterpipes has also been a tradition among the indigenous people of Africa and part of Asia. It is only in recent decades, that the shisha became popular in Europe and North America. Originally, cannabis leaves were mixed with other herbs and spices and the resulting sticky paste was smoked; the name shisha may have come from the use of hashish in these pipes. The shisha comprises a head, body waterbowl and a hose. Tobacco is placed in the head then covered with lit charcoal. When a smoker inhales through the hose, the tobacco and charcoal are drawn down the long body to the water bowl and then onto the smoker. Despite popular belief, the water has no filtering effect.