I will try to improve on Diego's translation:
There is a lot of sound and smell with pop corn. Better would be 'You get a lot of sound and smell when you eat popcorn.
I don't like to eat it in the cinema. This is if you are specifically talking about popcorn (it). 'eat' without 'it' means eat anything.
I think you need to concentrate to enjoy the film. or I think you need to concentrate on enjoying the film.