Train operator Northern is warning 'sly vapers' they may be told to leave the train if they are caught.
Northern said it has received dozens of complaints over the last year from customers who are fed up of "inconsiderate" individuals vaping in busy carriages and on station platforms.
Seventy-seven passengers have raised concerns about vaping in post-journey surveys since April 2024 and 29 have submitted written complaints.
Another 59 have made complaints to Northern on social media.
Vaping has not been permitted on board Northern services or at any of its stations since a ban was introduced in 2014.
But members of Northern’s traincrew say they catch people ignoring this rule on a daily basis and some become rude and aggressive when they are asked to stop.
They have also seen people make poor attempts at hiding their vaping by doing it in the toilets or blowing the vapour into footwells and carriage vestibules.
Vaping irritates passengers and can set off smoke alarms, forcing the traincrew to temporarily halt the service and delay everyone on board while safety checks are carried out.
Matt Rice, Northern’s chief operating officer, said:
“We want to be clear that vaping is not permitted on our trains or at any of our stations.
“We are encouraging people who travel on our services to be considerate of others so everyone can enjoy a pleasant journey.
“Those who are caught vaping may be asked to leave the train by a member of staff and we will not tolerate any abusive or aggressive reactions.”
It is also against the law to smoke on Northern trains and in its stations. Those who are caught can be prosecuted and fined.
People who witness any illegal activity are encouraged to report it to British Transport Police by texting 61016 or by calling 0800 40 50 40.

Spanish airport operator acquires Leeds Bradford Airport in £270m deal
Amended Christmas Bus and Train services in Skipton and Craven area
Skipton RFC scores £500 kit sponsorship with local opticians
Jack and the Beanstalk panto to be performed in Skipton
Number of primary school children being expelled a 'shocking indictment on society'
Steeton Court Clinches Victory in Annual Christmas Cake Competition
Airedale NHS microbiology staff announce December strike
Patrolling street marshals return to Skipton for festive period
Glusburn Community Arts Centre to host Santa's Grotto and film screening
Skipton MP Welcomes New Law to Protect Livestock and Farmers
Route Revealed for Rudolph's Tractor Run this Sunday
Skipton charity refocuses its mission as demand for children’s mental health support surges
Airedale emergency department 'exceptionally busy' with flu cases rising
Skipton Brass Band Conductor shines on Channel 5’s All Creatures Great and Small
Local dads raise £11,892 to support Airedale Hospital and Community Charity
Yorkshire Water finally lifts five-month hosepipe ban
Don't blame wildlife for £11.7m Kex Gill overspend, say Green councillors
New school observatory opens to inspire next generation of astronomers
Brave dippers raise more than £5,000 at Sue Ryder’s first Big Dip Dales
Tourism tax would be a 'hammer blow' for hospitality, says Skipton MP


