Should supermarkets remove sweets from their checkouts?

Different supermarket chains have different policies when it comes to the products they display by their checkouts. Sainsbury's don't allow sweets or chocolate next to its checkouts except in its smaller shops. Similarly, Tesco only have confectionery on display by the tills in Tesco Express branches. Iceland has sweets at one checkout per store while Asda apparently only has sweet displays at a third of its tills (although this isn't much help if those are the only tills open or the ones with the shortest queues).

In comparison, Lidl has been trialling a 'healthy till' practice. These checkouts have fruit snack packs and juice instead of fizzy drinks and confectionery and on the back of their success, Lidl are promising to increase the number of healthy checkouts in their stores.