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Lured in by propaganda, many who flee western countries to join Islamic State find the realities of living under the terror group's rules very different from their expectations.
But ITV News Security Editor Rohit Kachroo says returning home is not a simple task.
Many, like Kadiza Sultana, who is believed to have been killed in an airstrike in Raqqa - decide the risk is too high to leave.
A lawyer who represented the family of Kadiza Sultana, who is believed to have died in Syria, at the time of her disappearance from the UK, has told ITV News her death is a testimony for others of the risks going to a warzone.
Tasnime Akunjee said the 17-year-old's death is "devastating" for her family who were trying to help Kadiza flee Syria and return to the UK when she was reportedly killed in an airstrike.
"Perhaps the only benefit out of this is as a tombstone and a testimony for others of the risks of actually going to a warzone, to dissuade people from ever making that choice."
Latest ITV News reports
Kadiza Sultana, who joined IS in Syria, had emotional phone calls with her sister before she is thought to have died in an airstrike.
ITV News Security Editor Rohit Kachroo examines what makes young westerners want to travel to a war zone in Syria.