Too many polls are flawed by asking less-than-representative samples of people, samples that are too small and by asking leading questions, often by polls which seek a particular outcome. There are reputable pollsters who work on these things. Polls, whether you like it or not, are embedded in our democratic process. The UK forbids polling on the day of the election except for exit polls, which tend be be extremely accurate. If you want to ban polls (I'm sure you don't), we should also be banning tabloid newspapers and Fox/Sky News, which have the same baleful influences on the electorate that you list.