What is the function of the roaches as far as preparing a Cannabis joint is concerned? Roaches do not act as filters per se, but they permit for the seamless flow of the smoke. This is usually followed by the condensation of the smoke in the cylinders. A good quality roach will also prevent the dissolution of the joint once it is in your mouth. It also eliminates the risk of getting your lips burned as you follow through the last smoke. Discussed below are tips that you could make use of when ...