(Telegraph) - Britons are turning both healthy and French if forecasts from the Treasury’s official economic arbiter are to be believed. By 2018, the nation will be smoking 9bn fewer cigarettes and drinking 1.6bn fewer pints of beer and cider than last year, according to the Office for Budget Responsibility (OBR). But, dealing a blow to British traditions, an additional 856m large – 250ml – glasses of wine will be quaffed. The OBR has to make assumptions about social habits in its economic forecasts to estimate future tax revenues. Even so, the scale of the national health kick it anticipates is striking.