Had tooth out yesterday...dentist said wait 2-3 days to smoke again but everything I'm reading says to wait 24 hours. How long should I really wait?

If you must smoke... ... follow the instructions of the person who is treating you.
Forever. Smoking is stupid. It will irritate surgical site and delay healing. It will stain your fingers and teeth, give you bad breath, reduce productivity, damage lungs, liver, kidneys, heart, circulatory system. It will cause your skin to prematurely age. You can drown as cancerous lungs fill with fluid, or suffer the agony of a heart attack, or have cancerous parts of your jaws/face carved away.