Answer: You would be more like the accident was very serious, and the crash was a big damage.
Explanation: Elizabeth Loftus and John Palmer, studied how the use of verb can affect ones psychological thought while responding. Their discovered that using the verb 'smash' make people to think an accident has caused more damage, than using the verb 'hit'.
It would be more lighter to use the verb 'hit' than the verb smash. The verb smash will likely cause the person to exaggerate an accident, instead of thinking of it, the way is happened.