Replying to Used car buying questions?

I'm buying my first car and I'm coming up with a list of questions for the seller:
Any accidents?
Mechanical problems?
How many miles on the tires?
Last engine maintenance?
Any major dents/scratches?
Are you a smoker?

Thats all i've come up with but theres gotta be some more questions!

http://www.autotrader.com/fyc/vdp.jsp?ct=p&car_id=283836513&dealer_id=65528995&car_year=2001&rdm=1280556191289&lastStartYear=1981&model=RAM1504WD&num_records=25&systime=&make2=&highlightFirstMakeModel=&start_year=2000&keywordsfyc=&keywordsrep=&engine=&certified=&body_code=32&fuel=&awsp=false&search_type=both&distance=25&marketZipError=false&search_lang=en&sownerid=100006196&showZipError=y&make=DODGE&keywords_display=&color=&page_location=findacar%3A%3Aispsearchform&min_price=0&body_style=TRUCKS&drive=&default_sort=priceDESC&seller_type=b&max_mileage=&style_flag=2&sort_type=priceDESC&address=11769&advanced=&end_year=2011&doors=&transmission=&max_price=10000&cardist=11&standard=false