I popped the hose off of the EGR, and blew air into it with my mouth.
Your sentence is ambiguous, but I assume that you blew air into the green hose.
If that is the case, then I agree with horseydug, I do not think that your test is valid (since the hose that connects to the other side of the EVR is still connected).
Also, I would not recommend putting your mouth on any car part. Car fluids (oil, gas, etc.) are known carcinogens (i.e., they cause cancer). As a matter of fact, when I work on a car I wear latex gloves as much as possible. You would be surprised how easily your skin can absorb fluids into your body.