Good old tomatoes and lycopene to prevent lung cancer,u see they have anti cancer properties,but most of the benefits are found in cooked  tomatoes like in pizza,tomato sauce,tomato paste,ketchup are better sources of lycopene than fresh tomatoes.But check the salt and sugar in them use low salt and sugar when ever possible,tomatoes is the one food i love i eat tomato sauce at least once a day and been doing this for ever maybe 30 something years,that all being said i believe maybe thats the reason of all the members of my family that i did not die young from smoking i did smoke for 46yrs,and not one person in my family lived past 55 yrs that smoked,plus i like pizza,tomato paste,tomato soup,salsa all which have lycopene.