Mad Labs Disposable Sour Razz high has a slow onset, leading some impatient consumers to increase their intake before they feel its effects. After about 15 minutes, though, some strange, head-focused sensations set in like a flushing in the cheeks and some twitching around the temples. Ripples of relaxation may roll through the body, emanating outward through the core and extremities. Smokers who are active or out on the town can suddenly feel burdened .