You need a smoke alarm on every level of your home. It’s preferable to keep them near the kitchen and sleeping areas, as well as high fire hazard areas (e.g., near the fireplace.) A smoke alarm near the kitchen may be triggered occasionally when you’re cooking at high heats, but don’t disable your alarm – that’s just an indicator that it’s in working condition. Waft the air around the alarm until the alarm stops, or look into purchasing one that has temporary decreased sensitivity settings.