THE father of a young man who was killed moments after his first encounter with drugs is urging others not to make the same mistake.
Andrew Bond said his son Tom, 20, was the kind of person who would give the shirt off his back to help someone out.
In a tragic accident, Tom was struck and killed by a train after what his father described as a bad reaction to his first use of marijuana.
Tom's friends said he went into a panic attack before crossing the train line's safety barrier at Bundamba about 4am on Saturday.
He was hit by a freight train and killed instantly.
Moments before his death, the former St Edmunds College student had been visiting with a friend who needed some support.
"He was a rock for people to rely on," his father said. "He always had big a smile on his face and an even bigger heart.
"His sudden death has left a lot of people in this world sad."
Andrew Bond, 44, said his son's death was a grave lesson to anyone who might be considering drug use.
"My message to people is to not experiment - it's not worth the risk," he said.
"My son was a great kid who made one mistake and now he's paid the ultimate price for it.
"I don't think kids today realise the impact they can have on other people once they're gone."
Mr Bond said his Brassall family had been left devastated, especially Tom's two sisters and two brothers.
"His youngest brother was six and they were very close because Tom was currently living at home so they hung out all the time."
Mr Bond said his son had been working as a membership consultant at Goodlife Gym - a job he enjoyed because it allowed him to help people.
He said family and friends were travelling from as far as overseas to attend Tom's funeral service, details of which have yet to be announced.
Police are continuing their investigations into the incident.