Is throat cancer possible from only social smoking?

Yes. Tobacco use does not cause cancer in dose dependent fashion. Your personal genetics influence your risk for tobacco-induced cancer. No amount of tobacco should be viewed as safe.
Sure. Smoking does nothing but bad tings, and even social smoking as well as even second hand smoke has caused cancers. Stop smoking to improve your health now and in the future.
Some more. There are other carcinogens, nicotine, alcohol, chemicals and personal patient risks! but smoking is high on the list for throat, esophagus, and lung cancers.