Pharmacology C.N.S f1dcb1ce Drug used for cessation of smoking - A Theophylline B Biclutamide C Salmeterol D Varenicline High-Yield Explanation Ans. is 'd' i.e., Varenicline o Varenicilline is a direct acting nicotine agonist with selective action on a4 b2 isoform of Nm receptors. It is an antismoking drug.