I've been ejected from the golf course management degree (even though I never hit a golf ball). It wasn't only the constant fear of being hit by a ball, it was all the fertilizer I inhaled from the greens. I'm now studying 'Pataphysics, the science of the particular, the science of 'laws governing exceptions'. I've swapped golf holes (green holes) for Black holes.
Chimneys are deep, wide fractures, usually in a vertical wall, into which you can get your whole body. To negotiate them the smoker needs to smoke inside, ‘smoke like a chimney’, using the appropriate chimney technique, that is, pushing as if he intended to thrust the two walls of rock apart.