The G Pen Dash+ utilizes a hybrid heating system that vaporizes dry herb through conduction (vaporization via direct contact with a heating element) as well as convection (vaporization via heated air). If you find that your vapor production is insufficient, there are three things you can do:

• Increase temperature setting.  The higher you go, the more vapor production you will experience (usually at the detriment of flavor, but not of effects).
• Wait for the device to reach temperature before drawing.  The device will vibrate and the session timer will begin to countdown in the upper left corner of the display.  
• Long and sustained draws.  The longer draws you take, the more your material will vaporize via convection heating. The large dual clean air intake channels were engineered for maximum airflow, which leads to increased vapor production.