Doctors have called on the Australian government to further subsidise nicotine replacement therapies to help people quit smoking.

Allowing smokers to use more than one therapy at a time would make it more accessible to those at the poorer end of the spectrum, according to the Royal Australian College of General Practitioners.

Figures used in a new report by the RACGP showed just 6.5 per cent of those in the highest socio-economic areas smoked daily, but that figure almost tripled to 17.7 per cent in the lowest.