Castleford have issued lifetime bans to two supporters following incidents at the matches against Salford and Warrington in recent weeks.
A flare was thrown on the field during the Tigers’ defeat to Salford and there were further crowd disturbances the previous week at the Halliwell Jones Stadium.
The club issued a plea for information and has now taken action against two of the perpetrators.
Cas say they are still following up additional lines of enquiry surrounding incidents during the matches
Club safety officer Ian Crawford said: “The club will continue to hand out lifetime bans to anybody found guilty of these offences.
“Letting off these devices in stadiums is causing health problems to people who are breathing in the smoke.
“Rugby League has had numerous incidents in the 2019 season of smoke bombs and flares being set off inside the ground.
“This has resulted in a number of people requiring first aid and hospital treatment after breathing in the smoke from these devices.
“The Cas fans are amongst the best in the country for getting behind the team, it is vital that we don’t allow this small minority to spoil the gameday experience for everyone else.”