His mother, who wanted to remain nameless, said in the past two weeks she had noticed a huge change in his personality.
"I've got my boy back," she said with tears welling in her eyes, "He had just gone into a shell. He smiles again and he talks again. He never used to talk."
Having experienced the power of synthetic cannabis first-hand, Andrew said he wanted the drug banned from New Zealand.
"It's just hurting people," he said. "It was affecting my work life, social life and money."
The organiser for the Tauranga protest, Renee Raynes, was pleased with the turnout and said she had seen the effects of the drug on a number of people. There was a lot of emotional connections to the drug for people involved.
"Everyone is here for a reason," she said. "It's affecting so many people. This is about taking a united stance against a poison that is destroying families. It is time the Government banned this poison completely."