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When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.
Episodes
1Pilot 2The Big Bran Hypothesis 3The Fuzzy Boots Corollary 4The Luminous Fish Effect 5The Hamburger Postulate 6The Middle-Earth Paradigm 7The Dumpling Paradox 8The Grasshopper Experiment 9The Cooper-Hofstadter Polarization 10The Loobenfeld Decay 11The Pancake Batter Anomaly 12The Jerusalem Duality 13The Bat Jar Conjecture 14The Nerdvana Annihilation 15The Pork Chop Indeterminacy 16The Peanut Reaction 17The Tangerine Factor