An ambulance had to be called to take two nine-year-olds and one 13-year-old from their house in Tambon Hua Wiang in Muang district to Lampang Hospital.
Their relatives said they held the barbecue party indoors because it was hot outside. Smoke from the barbecue later caused five people to faint.
The five were rushed out of the room. Two adults recovered soon but the three girls vomited and had difficulty in breathing so the family called for an ambulance.