Reminds me of a very unpleasant flight when I was in that same seat. The man behind me lit up a cigar. I called the stewardess and she asked him to put it out. He refused.
So I stood up in the aisle and stood beside him. He finally got annoyed and demanded to know what I was doing. I told him I was going to throw up and when I did it would be on him.
He put out the cigar.