What is a vice you will not tolerate your other half to have?

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When we talk about vice, it can be referred to a fault, defect etc in more minor terms... Some of the vices could be gambling, smoking, drinking (alcohol), etc... The question is: what is a vice which you will not tolerate your other half to have? I mean, of course, no one will wish or their other half to have any vice if possible. I'm also of no exception. However, what is the one which will make you "snap"? And also the reason why you think that is the worst of all? For me, I guess it will be gambling. I had seen of examples of family breaking down because of the heavy gambling issue. The debt will continue to rise, while the family struggles to help pay off the debts... I think this is the worst of all, and I will certainly not tolerate if I found out that my other half do that as well.