Tonga goes to elections on 18th November with 74 candidates registered.
Sione Fonua, who was to stand in Tongatapu 2, says he withdrew to make it easier for a new candidate to come through.
Figures indicate the drug problem is going from bad to worse, with more than half the activity in the country's courts involving drug offences.
Mr Fonua says the current parliamentary line up is not treating the drug problem as a priority.