Smoke Grey Ceramic can be used outdoors, but it depends on the specific product and its intended use. Some smoke grey ceramic products are designed specifically for outdoor use and are durable enough to withstand the elements. However, other smoke grey ceramic products may be more suitable for indoor use only. It is important to check the manufacturers recommendations and specifications for the specific product you are considering to determine if it is suitable for outdoor use. Additionally, proper installation and maintenance are essential to ensure the longevity and performance of any ceramic product used outdoors.