The online Lotto app from the National Lottery is normalising gambling, a leading addiction expert has warned.

Dr Colin O'Gara, head of addiction services at St John of God Hospital in Dublin, also said people being treated for gambling problems reported that "the accessibility of apps makes their problem a whole lot worse" .

The National Lottery mobile app, which was launched in June, allows players to play the Lotto, EuroMillions, Daily Million and Instant Win games.

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