Six out of ten adults in the UK spend up to £50 each month gambling on sporting events or the Lotto, according to government figures.
The industry is already worth £42bn a year, but the government's proposed shake-up of the UK's gambling laws could alter that.
Analysts predict that as a result of the changes the annual sum gambled in Britain will rise to more than £60bn.
But how and where is all this money spent?
It is estimated more than 30 million people regularly buy a ticket for the Lotto.
In 2000/01 a total of 4.983m tickets were sold, according to the National Lottery Commission.
It estimates the average household spends a combined figure of £5.37 on the Saturday and Wednesday draws and £2.49 on the Saturday draw alone.
Weekly Lotto spend per household per socio economic group
A £5.98
B £5.50
C1 £5.35
C2 £6.31
D £5.09
E £4.13
Source: National Lottery Commission
The UK Lotto is ranked the second largest of the192 lotteries worldwide (by sales).
It also pays out the second highest amount to good causes and the tax man.
A study by the National Centre for Social Research estimates that of those who play the Lotto, less than 1% are problem gamblers.
But Gamblers Anonymous says since the first lottery ticket was sold eight years ago, the number of calls it receives has increased by over 17%.
But its says this is not necessarily directly due to the Lotto or scratch cards.
Bingo clubs saw a boom in trade in the 1990s.
There are currently 705 licensed bingo clubs operating in the UK, according to the Bingo Association.
It estimates the average customer spends up to £20 on a night.
This includes bingo tickets, VAT and other duty, other gaming, food and drink and does make allowance for winnings.
Addiction
350,000 Britons have a gambling problem
Predicted to rise to one million if gambling changes are introduced
Source: National Economic Research Associate
Over £930m was paid out in prizes in 2000 in the clubs and industry made an estimated pre-tax profit of £119m in the same year.
Bingo is the only gambling activity where women are more likely to play than men, according to the association.
Seventy per cent of bingo players are women and 30% are men.
Bingo playing is spread evenly across all age categories, with the average age of players being under 50.
There are 250,000 slot machines spread across the UK.
Britons fed an estimated £10.43bn into the machines in 2001/02, according to the Gaming Board for Great Britain (GBGB).
This works out at an average of £28m a day.
A total of £8.76bn was paid out to punters last year.
There are 123 registered casinos in the UK, more than any other country in Europe apart from France.
The amount of money exchanged for gambling chips last year totalled £3.5bn, according to the GBGB.
This was a rise of 8% on the previous year.
The average amount a person spends during a trip to a casino in the UK is £44, according to the British Casino Association.
The amount retained by the casinos each day totalled £1.7m in 2000/01.
Betting at the bookmakers - on anything from the horses to the name of David and Victoria Beckham's new baby - also amounts to over £1bn.
The last study done on the subject, by the University of Salford, said £1.7bn was spent on betting in 1998.
Given the nature of the internet, it is difficult to get any reliable figures on the current and predicted size of online gambling, according to the GBGB.
But it says all commentators agree the global market is large and growing.
It is estimated internet gambling contributed just over £21bn to global gambling turnover of £638bn in 2001, according to research undertaken for the Betting Office Licensees Association.
Of this, betting on horses is estimated to have made up £2bn, sports betting £9bn, online casinos £5bn and lotteries £5bn.