Smoke in general is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass, and so is like that in Narutoverse.
Smoke Ninjutsu is first of all, not an element which is important to mention because a lot of people think it is. Smoke is only an unique, special and advanced control over smoke that was previously created and the user cannot create smoke. We create smoke by the use of tools such as; smoke bombs, gas masks and the most practical out of all - wrist launchers (especially when they are one-barreled). Smoke is very dangerous and its most known features are that it can blind and make a person have trouble breathing and suffocate. Due to you not producing smoke from your body but just using an already existing smoke, it can also have bad affect on the user. That's why it's important to wear a gas mask or a ventilator.
Smoke has no elemental strengths and there is no elemental technique where it would clash with Smoke and Smoke would win. But Smoke has elemental weaknesses and those are Wind Release and Water Release. Wind will blow the smoke away, and water diffuses, soaks up the smoke when coming in contact with it.