you can use whatever lighter you want. what the real secret is how close you hold the flame. you can almost vaporize your weed in a bowl by properly controling how close your flame is to the weed. just because it doesnt light on fire doesnt mean nothing was inhaled. and magnifying glasses arent much better than flame because it does essentially create a flame, though you can make it just be warm over a given spot by changing the focus of the light.
when you learn to walk on the planes of existence, you can learn to run on the planet of earth