Yes, Smoking weed can cause eye bags. First, you should know that most bags under the eyes are the result of accumulated fat in the eye area. Why they occur. When the septum surrounding the eyeball weakens, it will lead to causing the outer layer of fat within the socket to sink forward. Then in this way, they can make it look like you have literal "bags"under your eyes. And if you keep smoking weed, it will cause eye bags, because they are caused by a complex interaction between your body and the same kind of chemical reaction that produces bruises. Also, not enough sleep, stress can lead to eye bags too. In this situation, you can put cucumbers on your eyes and stop smoking weed.