If you cover the air intake hole as you draw, you will have much better luck if you take a mouthpull as opposed to drawing vapor directly into your lungs and trying to pull the vapor as you inhale. Imagine drawing liquid through a straw into your mouth. That is a mouthpull. Draw the vapor into your mouth using mouth suction with your finger on the air intake hole. As you finish your draw, remove your finger from the air intake and inhale cool fresh air mixed with the vapor from your mouth. You can mix it up by feathering the air intake to create your personal technique. Mouthpulling creates wonderful vapor and the resistance is an asset. That said, the new generation titanium tips offer the least resistance although the M18 tip performs better than the 17 model. You can create even less resistance by carving out some divets on the top edge of your M tip to match the exterior channels of the tip. A small file will do the job nicely. @cybrguy You are the absolute Haiku King!!! How many Haikus do you imagine you have spun around the Vapcap?