New super-strength marijuana readily available on US streets is prompting the White House to change direction in its war against drugs. Research from the government-sponsored Marijuana Potency Project claims today's cannabis is more than twice as strong as in the mid-Eighties, leading to greater health risks for those smoking it at increasingly younger ages. Now President George Bush, who had already promised a more aggressive campaign against substance abuse, has ordered that resources be allocated to fighting so-called 'soft' drugs instead of concentrating on harder forms, such as heroin and cocaine. 'We are working hard on education, but unfortunately a...