Glad you asked, warren. Stress is an instinctive response, analogous to the swelling of flesh in response to injury. The pipe experience -- including but not limited to Nicotiana absorption -- quells that process, and allows me to look at the stressful events not as impediments, but opportunities, e.g. "How can I improve this situation to my advantage and that of the Heavens?"
I refer to stress often as "choking up on the bat." Not that I play baseball, or understand it in any way, but I remember this being a sign of a nervous player who was too focused on being nervous to focus on the ball. $0.02, as usual, and you probably should ask for that in pesos or euros.