Late night revellers are being served drinks in plastic or toughened glasses on the first weekend of a glass ban in Glasgow's city centre and west end.
The majority of people attacked are under the age of 35
About 90 clubs and pubs with 0300 licences are now subject to the policy, which aims to reduce glass attacks.
Latest figures show police recorded 59 attempted murders or serious assaults with glass in the 12 months to November 2005 in both areas.
The city's licensing board will extend the ban to pubs in June.
For the moment, the ban only applies to nightclubs and "superpubs".
About 70 clubs have switched to plastic and "tempered" or toughened glass, which shatters into small pieces when it breaks.
A further 21 "superpubs" with late night entertainment licenses have made the switch.
Some venues selling fine wine and champagne have been granted exemptions.
Malcolm Cunning, vice convener of Glasgow's Licensing Board, said: "We are implementing the ban as a measure to ensure customers have a pleasant and safe environment.
"The quality of plastic and toughened glass has improved enormously.
"We are not killjoys, the trade and suppliers are expecting it to become the norm.
"All premises are quite willingly taking part."
He added: "It may be slightly more difficult to introduce in pubs."
Glass attacks in Glasgow city centre and west end
Clubs or superpubs 37
Police figures for November 2004 to November 2005 show the majority of people attacked were under the age of 35.
In one case, a man was stabbed in the neck with the stem of a glass.
He fell onto a table where two off-duty surgeons saved his life.
The cost of the switch to the licensed trade is put at up to £10,000 per venue.
Eddie Tobin, chairman of the Bar Entertainment and Dance Association, said: "The nightclubs largely adopted and embraced the policy before its introduction and the vast majority are supportive.
"The only concern is the board acts reasonably in terms of exemptions and so far I have no complaints."
He added: "I defy anyone to tell me the difference between tempered glass and the real thing."
Bars in Greater Glasgow have until 31 January, 2007 to comply with the scheme as a condition of their licence.
We asked if you agreed with the move and should it be extended to pubs?
I fully agree to this new move. At 24-years-old I recognise the need for plastic glasses and bottles. The damage that can be done by a shattered glass or bottle can be devastating and fatal. In an environment fuelled by alcohol it will be much safer for everyone.
Pamela, Paisley, Scotland
Plastic and metal bottles have been on the rise in the states. It's been a long time coming especially in stadium sport events and late night bars.
Paul Nichols, Lake George, New York USA
I must admit I did feel like a kid at a party when I was handed a plastic beaker, but when I read the statistics of attacks, I strongly believe this should be rolled out.