Research showed that using e-cigarettes and cigarettes increased the likelihood of experiencing more severe and frequent ocular symptoms than users of a single tobacco product.
A study conducted by researchers at McGill University in Canada and Stanford University in the US was published by JAMA Ophthalmology Journal and explored the impacts of cigarettes usage on ocular symptoms on 4,351 individuals aged 13 to 24 years.
The most significant effects were seen in past seven-day dual users, who experienced severe itching, redness, dryness, glare, blurriness and headaches, while past 30-day dual users only had severe dryness, and frequent pain.
Of all participants, 55.9% were dual ever users of e-cigarettes and cigarettes, and between 1.1% and 3.9% reported severe to very severe ocular symptoms, including more severe dryness, blurriness, and frequent pain, compared to those that never smoked.
Researchers said: 'These findings provide additional reasons for users of e-cigarettes and cigarettes to reduce their tobacco use to possibly prevent or minimize ocular symptoms.'