Hand-rolled cigarettes tend to be unfiltered, putting users at greater risk of developing lung cancer, researchers say.

Reuters reported Sept. 5 that researchers from Norway's Sorlandet Hospital noted that while users of hand-rolled cigarettes "consumed (fewer) cigarettes, and statistically had fewer years of smoking, hand-rolled cigarettes were more carcinogenic, resulting in a higher incidence of lung cancer development."

The study of 333 people found that 80 percent of those with lung cancer primarily smoked hand-rolled cigarettes. Experts noted that the findings could be troublesome if rising cigarette prices encourage more smokers to roll their own.

Researcher Heidi Rolke and colleagues presented their research at the World Conference on Lung Cancer in Seoul.