Yes he peed in your flavoring, no question about it. On a side note tell him to increase his fluid intake, his pee is too dark and he is risking dehydration. Also if he drinks more water his pee will be clearer making it harder to detect. Also tell him to eat some asparagus, I’ve heard that asparagus pee goes really well with tobacco mixes. Like grandma used to say, “When life gives you lemons, make lemonade”, let me know how it works out for you.