Reasons why people use electronic cigarettes: No Flame No Ash No Tar No Stub No Carbon Monoxide No Second-Hand Smoke No Smoker's Breath No Smelly Clothes Advices for smoke quitting: 1: Use the cartridge with high for 6 weeks by normal smoking habit. 2: Use the cartridge with medium for 12 weeks by normal smoking habit. 3: Use the cartridge with low for 4 weeks by normal smoking habit. 4: Use the cartridge with zero for 2 weeks. At last, congratulation for your success. (This is subject personal, just for a reference) After-sale service: 15 days warranty policy Replace the broken parts freely when next order Shipping Tracking Service OEM program, brand your product and packaging, be the hot seller in your area