Culture minister Hugh Robertson said there was little evidence that high-stakes gambling machines caused serious problems.
In legal joints regulators can bar the most addictive sorts of gambling machines.
They include a complete ban on wagering on college and amateur sports, a ban on Internet gambling and a ban on credit-card cash-advance machines in gambling parlours.
Even before opening night, there was sharp disagreement among aficionados over Mayer's switch from the Renaissance Palazzo Ducale to a casino floor filled with slot machines, gambling tables and faux neon.
Latest figures suggest three quarters of 12 to 15-year-olds have played slot machines with 5% showing signs of gambling addiction.
Gambling supporters managed to get a tax break for slot machines included in a post-Sept. 11 economic-stimulus bill.
And the Holland Casino, also located between gates E and F, has gambling games from roulette and black jack to slots and video machines.
Bookmakers, bingo halls and amusement arcades in Medway will be invited to help draw up a code on gambling after concerns were raised about "highly addictive" high-stakes machines.
Coming soon may be a move to allow the use of banknotes in fruit machines, giving punters an easier way to pursue a particularly addictive style of gambling, which worries Britain's anti-gambling activists.
The move online threatens some traditional forms of gambling, such as betting on horses, but appears to benefit others, such as slot machines and lotteries.
Part of the reason for this increase is the spread of video "malls, " which are what gambling entrepreneurs have come up with to get around a state regulation that limits an establishment to five machines.
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