Plain cigarette packets could be one way of reducing the number of smoking-related deaths by helping people to quit.
According to Amanda Sandford, research manager at Action on Smoking and Health (ASH), plain packets could be more effective than health warnings because the strength of the nicotine addiction often causes people to ignore these warnings.
She added: "We know the tobacco industry puts a lot of resources into making the packs as attractive as possible.
"If that were no longer possible and all cigarettes were put into plain standardised packs, then they would be much less attractive and people would think twice about continuing to smoke."
There are an estimated five million people around the world who will die from tobacco-related heart attacks, strokes, cancers and other diseases, according to estimates from the Centers for Disease Control and Prevention.
This figure was published in advance of yesterday's (May 31st) World No Tobacco Day, which aims to encourage people not to smoke for at least 24 hours.