Scientists say evidence suggests that plain packaging for cigarettes diminishes the appeal of smoking, as anti-tobacco campaigners hoped.
European countries are considering whether to follow Australia, which last year became the first country in the world to sell cigarettes in plain packets.
In Australia's case, the cigarettes are sold in identical olive-green packets bearing the same typeface, in addition to health warnings.
Researchers questioned 536 smokers in the Australian state of Victoria during the transition phase, when both branded and plain-pack products were on sale. Nearly three-quarters of those interviewed were smoking from plain packets, and the others from branded packets.
Plain-pack smokers were 66 likelier to think their cigarettes were of poorer quality compared with a year earlier, and were 70 per cent likelier to say they found them less satisfying.
They were also 81 per cent likelier to have thought about quitting at least once a day during the previous week and to rate quitting as a higher priority in their lives compared to smokers using brand packs.
The study, published on BMJ Open by the British Medical Journal, did not follow up these smokers, to see what they thought or did after the transition period.
But, it says, the "early indication" is that drab packaging takes the gloss off cigarette brands.
"Plain packaging is associated with lower smoking appeal, more support for the policy and more urgency to quit among adult smokers," it says.