The last time I drove my car was maybe 5 or 6 days ago. Today I turned it on and white smoke was coming out of the exhaust and the car started to shake (more than normal; i know it's an old car) almost like from front to back?! It was absolutely fine the last time I drove it and I haven't noticed any leaks (unless it dried up before I saw it). Any idea what this could be? (i am a poor college student who knows nothing about cars!)
Added (1). *No check engine lights or any other lights are on*
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