Tire being cold is a big contributor. Personally I think its fun when you lock your rear end and sliding around, but it burns rubber. I don't do it traffic unless I need to. When I go stunting, I do some practice slidings. Not only can they be fun and dangerous, but if you start slow slides and build your way up, you can learn on how to control emergency stops when you need to in real situations.
Last year, I had to do this after a small pickup truck turns in front of me and stops due to traffic and I do a 90 degree slide right up to its rear bumper. I was about 6 inches away from hitting the truck in the process.