According to the latest consumer-index figures from the Commerce Department, sales of chamomile tea and gas masks have shot up more than 50,000 percent in the past three weeks. 'Far and away, these are the biggest movers,' said Commerce Secretary Donald Evans, announcing the new figures Monday. 'For whatever reason, these are the two consumer items generating the most interest right now.' Also up sharply, Evans said, are sales of infrared night-vision goggles and aromatherapy oils. 