It appeared that Australia would take the lead in terms of relaxing the laws around medicinal cannabis, "while in New Zealand this still appears to be on the distant horizon".
The attitude to medicinal cannabis has relaxed in recent times, with about half the states in the United States allowing it, and three states allowing the legal growing of cannabis for recreational purposes.
Nichols said research carried out by the late Ralph Ballinger in Blenheim the 1950s on developing a opium poppy industry was not followed up on.
Instead, the industry went to Australia, and Tasmania now produces more than 50 per cent of the world's legal morphine and codeine.
"Just to rub salt into the wound, trials with the opium poppy were undertaken New Zealand last summer - only 50 years too late. "Will medicinal cannabis provide a similar example?" he said.
Nichols, a retired Massey University teacher and a regular contributor to NZGrower, is one of only 25 honorary members of the International Society for Horticulture Science.