for the same reason that a torch lighter is less suitable than a bic, it is also more suitable than a bic. although more heat is bad, a torch lighter is far more effective at RADIATING heat than a bic, which means you can keep the flame itself far from the bowl but still combust the herb at the lowest possible temp with the heat emanating off the tip of the flame. so yea, if you're just gently stroking the tip of the flame across the bowl it will undoubtedly introduce more viable thc into the smoke.