£70m was staked on fixed-odds roulette machines in Exeter betting shops last year.
The Campaign for Fairer Gambling, which published the figures, is especially concerned about the effect on younger people, and the rise in use in both poor and affluent areas.
They've been described as the 'crack cocaine' of gambling because up to £100 can be spent every twenty seconds.
Frustration over cancelled Exeter elections
Opponents unite to demand Exeter elections
Push for fair education funding heading to Westminster
Devon politicians will head to the capital
19 Plymouth seats up for grabs in May elections
Plymouth won't postpone them
Two WW2 bombs safely removed in Devon
Cordons lifted in Exmouth and Plymouth
New Exeter City winger joins from Sunderland
Timur Tutierov on loan until summer
Plea for help as Devon pubs face crisis
'The trade is hunkering down and hoping for the best'
