Put up signs and annoyed fans will police it themselfs. Strength in numbers, 

I was annoyed a couple of years ago when we had reserved seats at Delaware and people were smoking around us. Ontario law prohibits smoking in grandstands with reserved seats, based on the fact you can't move away from the smokers, I assume. I emailed the track after that but haven't been back to see if they posted it as non smoking. Crazy thing is that even with general admission seats you can't always just move away from the smokers.

i am not a smoker, never have been. i do applaud peterboro speedway on their decision for a non smoking section, but am i missing something here?.  i think if you are that worried about an open air event being a problem with smoking, maybe you should not attend. you have tire smoke, sometimes oil smoke from engines, exhaust fumes, and what about brake pad particles floating through the air. i think that some times this issue goes a little to far. i know smoking is not good for you , but in this case i do beleive that smoking at a speedway should be the least of your concerns.

There is a big difference from smoke on the track to the smoke coming from the cigarette of a person beside you. It always seems that the smoke from a cigarette goes directly in a non smokers face and it smells disgusting. If people want to smoke that is their choice and decision and right. For the people that don't smoke its unfair that they should have to suffer from another persons habit.

There's nothing nicer than the smell of gear oil leaking onto a red hot rotor or how about inhaling all that carcinogenic laden engine oil when its mixed with speedy dry, pulverized into fine particles and drifting over the grandstands waiting for all the fans to filter it through their lungs. I especially like the smell of fibreglass mixed with ground synthetic rubber when a tire is rubbing on a fender for 20 or 30 laps and I don't think the fibreglass or rubber particles are really hurting my lungs when I breath them in. My personal favourite is the smell of unburned toxic fuel coming from every race car on the track. I wonder if 40 years of asbestos dust from the past years of racing will ever bother us when  a race car goes skidding across the infield churning all that dust up.
Just think, after we get rid of all the smokers, we can start picking on the little old ladies who need to use a gallon of perfume to mask their body odours. I know some people have severe allergic reactions to perfume  and go into respiratory failure from breathing perfume fumes.  Don't forget to leave all food products with peanuts at home this weekend because someone might have an allergic reaction to them and that would just spoil the whole weekend..