Young people mistakenly believe roll-up cigarettes are cheaper, taste better and are healthier.
That is according to a new study from Tobacco Free Institute of Ireland which is now calling for the price of so-called 'rollies' to be raised.
One of the authors of the report, Professor Luke Clancy, says although the rates of smoking among young people have gone down, the use of 'rollies' has risen.
"It was the first time ever that roll-your-own had overtaken manufactured cigarettes.
"There was a dramatic increase in roll-your-own.
Professor Clancy says price is also a big factor when it comes to smoking 'rollies' instead of manufactured cigarettes.
"The main driver has always been price and every time you get a substantial price rise you get a drop in smoking," he said.
"The trouble here is there's a price differential between manufactured and roll-your-own and that's, of course, why people smoke them."