The world’s biggest maker of e-cigarettes has shrugged off the challenges of coronavirus, the US-China trade war and tougher regulations to report a huge increase in profit, as more smokers make the switch to vaping.Smoore International Holdings, based in Shenzhen, China, posted a 40 per cent year-on-year jump in underlying net profit on Monday for the first half of 2020, to 1.3 billion yuan. Revenue rose 18.5 per cent to 3.88 billion yuan.“In the year’s first quarter, our sales dropped 8.8 per…