E-cigarettes will not be offered as an aid to help smokers quit until the full health impact is determined, doctors have said.

This week the government's product regulator said e-cigarettes and vaping products could be sold legally from mid-April.

Regulation will ensure consumers will have transparency over the vaping products they buy and help authorities stamp out black market and unregulated sellers.

But government doctors said the country will not go as far as some nations in promoting the devices to problem smokers.