By Lydia Veljanovski A reformed drug dealer-turned-pastor who works with addicts has warned a synthetic drug will cause “mass death” and a US-style opioid crisis here. Pastor Mick Fleming, 58, who runs Church on the Street, says the charity has already dealt with eight deaths this year – compared to the three annual opiate deaths it usually sees – due to the influx of nitazenes, which are being cut with street drugs. Dealers are using the drug – some strains of which can be hundreds to thousands times stronger than morphine – to stretch out their supply and create an even stronger substance so…