While the pollutants in moxa smoke are within safe limits, it is best to avoid inhaling large amounts of any type of smoke. This is why moxibustion therapy practitioners prefer to use Longevity smokeless moxa sticks and limit their lung exposure to substances resulting from frequent combustion. These sticks have a hole in the middle which allows them to produce less smoke and smell while burning. The hole is also useful for placing the moxibustion sticks over acupuncture needles.