How is he hiding the chewing tobacco?!

My fiance has said dozens of times throughout the years that he has quit tobacco. But he was lying about it every time, though I think he had every intention of quiting. We were broke up for a time and a different guy I dated didn't smell like tobacco, it was nice. But now that I have got back together with my fiance, I smell it on him. And it was unbearably strong yesterday. But he claims he hasn't dipped for a year and to pester him to much would make him mad. But I know that's what I smelled!
So I want to find the evidence, but I have looked in his jacket and pants pockets. I don't think he has it hidden somewhere in my apartment. When he is here we are usually together.
But that night he went to a friends house for a few hours and came back smelly.
Could he dip at his house and it linger on his breath for several days?
I know the stench well and am sure that's what it is. But how can I tell him I don't want to kiss him because I smell it? He will get mad, the way he used to, and swear up and down he doesn't do it. He will never admit it, believe me.