He said he would be "very cautious" about decriminalising cannabis, as proposed by Auckland Deputy Mayor Penny Hulse, but he acknowledged the inconsistency of laws on cannabis and alcohol.
"I understand the younger generation saying to their parents, 'So you are against my drug of choice but what about your drug of choice?'" he said. "We tend to want to use a sledgehammer with drugs and a feather duster with alcohol."
But he saw signs that the "public voice" about the need to limit the misuse of alcohol was strengthening.
"I think there is further to go yet before the public voice will become so strong that the alcohol industry will be required to look at measures that the tobacco industry has been required to accept."
Mr Herring and his wife, Commissioner Astrid Herring, served in the Salvation Army's London headquarters before being posted to Pakistan. "It was an eye-opener," he said. "We never felt unsafe, but we were wise about our movements."
He said there were 50,000 Salvationists in Pakistan and the church was respected because of its work for the poor regardless of religion. Simon Collins