Jimmy Guichard in hospital shortly before his death
She calls for current legislation to be updated and has asked for a more "muscular" approach on the issue.
Items in the room have been removed by the police and it was unclear if they included the packet, or where exactly it was purchased from.
Police have handed the investigation over to the coroner as there was no third party involvement in the death and results from toxicology are awaited.
Jimmy, from Gravesend, died in his mother Karen Audino's arms after she had made the heartbreaking decision to turn off his life-support machine on October 3.
As she made plans for the sport-fanatic’s funeral, she retraced his steps to try to get some clues as to what had happened and to highlight the dangers of the substances.
Mrs Audino, 42, said: “I believe what he smoked caused his death and I want legal high shops banned, so nobody else has to go through this pain. He was fit and healthy, even the doctors said his organs were perfect.”
It is unclear which of the two shops selling legal highs in that street Jimmy had visited – UK Skunkworks or Dark Times.
During her visit to Chatham she identified herbal incense packets in both stores as matching the description of those his father found next to him. Some had names such as Amsterdam Gold Smoking Mix and Happy Herb.
Jimmy's mother Karen Audino
Both shops have said they have no knowledge of selling their products to Jimmy, but while UK Skunkworks denies they are harmful if used properly, the owner of Dark Times has taken all herbal incense off the shelves as a precaution.
A UK Skunkworks spokesman said there was no evidence he had bought any substances from their store. He added: "All our products are clearly labelled 'not for human consumption'".
Mr Guichard's mother has launched a Facebook campaign to highlight the dangers of legal highs, which can be found at www.facebook.com/Legalhighawareness.