The Scottish government bans open displays of cigarettes and other tobacco products in shops after an appeal against the ban was rejected.
Self-service tobacco vending machines are also banned under the law.
One of Britain's largest tobacco firms, Imperial Tobacco, appealed the new law, arguing that the Scottish Parliament did not have the constitutional powers to approve laws that control the sale and supply of goods. According to Imperial Tobacco, only the UK Parliament has the right to pass such laws.
However, the UK's High Court turned down the appeal claiming it was clear the Scottish Parliament was protecting public health when introducing the law.
know that reducing the number of people that smoke will have wide
benefits for Scotland's health and these bans will play a crucial role
in preventing young people from taking up smoking", said the Scottish Public Health Minister Michael Matheson.
The ban is said to strengthen Scotland's anti-smoking policy, which was introduced with the prohibition of smoking in public places in March 2006.