Pfizer Inc.’s voluntary recall of batches of Chantix (varenicline) in mid-July called attention to the smoking-cessation market, where the nicotinic acetylcholine receptor agonist holds lead position, with Glaxosmithkline plc’s Zyban (bupropion) – another oral prescription drug – also a contender. In line to potentially shake up the space with cytisinicline, a plant-based alkaloid, is Achieve Life Sciences Inc.