Not 100% effective, but it does help!
There is somewhat of a design flaw with this product which makes it a less-than-perfect solution for containing smoke. The issue is that the mouthpiece, or the end where you blow the smoke into, is not directly connected to the filter itself. This empty space between your mouth and the filter fills up with smoke (obviously) but that smoke never reaches the filter so when you move the device away from your mouth, the smoke just escapes from the device without ever having been filtered. It isn’t a lot of smoke, but it’s enough smoke to be detectable, especially if you are using it multiple times in one sitting. I tried to blow as hard as I could into the device to “force” that last bit of smoke into the filter, but it didn’t work. This actually made things messy because apparently when I was exhaling as hard as I could, I was also blowing saliva into the device or something, because it eventually became so filled with drool that it was leaking out the other end. Gross!<br />Anyways, this product is pretty useful for the most part, it definitely helped immensely to keep the room somewhat free of smoke, but I’d sit next to an open window just to be sure. If you’re looking for something 100% effective, this isn’t it. But if 98% effective is sufficient enough for your needs, buy it.
Rating: 3 stars