Too many vaporizers are available so you must not disintegrate while smoking. A push-able mouthpiece is included in the Yocan Evolve-D Vaporizer Pen. It packs your dry plants down to the two coils. This means that the chamber must be continuously opened to change your herbs further. The Evolve D Vaporizer Pen is exquisite and portable and is an excellent device for all of you who simply want to pack your steam up and enjoy your herbs without extra hassle.