Mark Murphy, from The Irish Heart Foundation, refuted the suggestion.
If you can vote at 18 you should be allowed to buy cigarettes.
Speaking on Kildare Today, John Mallon, of the tobacco-funded lobby group Forest Ireland, said 18-year-olds are adults and should be treated as such.
Refuting Mr Mallon's claims, Mark Murphy, from The Irish Heart Foundation, said restricting cigarette sales to 21-year-olds has been shown to reduce smoking rates among teenagers.

Friday's Kfm Obituary Announcements
New Cultural Programme Set For Castletown House
Celbridge Woman Who Lost Sister To CF Calls For People To Support Today's Fundraiser
Protestors, Including Kildare's John Dallon, Refused Entry From Government And Agriculture Bodies Meeting
Defence Forces Travelling To The Curragh Today For Training
Newbridge Silverware’s Silver-plated Cutlery Factory Officially Closes
Martin Heydon Will Meet Farming And Haulier Groups This Morning Amid Fuel Protests
Missing 17-Year-Old Joshua Treacy From Maynooth Has Been Located