By the end of the century, it says, tobacco could kill one billion people -- ten times as many as in the twentieth century.
thanks

是不是对句子结构有理解上的困难?me 写了:The W.H.O. found that {only five percent of all people live in countries with protections (like national legislation on smoke-free areas or bans on tobacco advertising)}.
By the end of the century, it says, tobacco could kill one billion people -- ten times as many as in the twentieth century.
thanks