JD Wetherspoon says its 38 Scottish pubs have had "a positive start" following the introduction of a smoking ban north of the border.
Wetherspoon finance director Jim Clarke said the first four weeks of the ban had been helped by a heavy marketing campaign and Easter falling later than last year.
However he says the group remains "very cautious" about the likely impact of the restrictions.
"In Ireland they had a good first month after the ban came in two years ago, which was then followed by a downturn."
Wetherspoon's like-for-like sales in the 13 weeks to April 23 rose by 3.2 per cent, versus a two per cent dip in the same period last year.
Total sales increased by 3.1 per cent to £209.3m. The pubco said the improved operating margin performance achieved in the first half "has broadly continued into the third quarter".
Mr Clarke says the group has seen a "gradual improvement" in trading in the last few months, with trading helped by a strong Easter.
Meanwhile the looming World Cup tournament was unlikely to result in a significant boost in trading, Mr Clarke said, with individual pub managers allowed to decide whether to show games.