For about 3 years. It is still working well in spite of daily use, and being dropped several times. I like it! It is small, quiet, stashable in a desk drawer, and has no moving parts to break. It uses less than smoking and the left-overs can be recycled into passable brownies. If you use it exclusively, instead of smoking, the morning "toker's cough" goes away. It was the best $139 I have spent in quite a while! Well worth the price! :thumbsup:

Granny :hippy: