Can I mix vodka and Henessy?!

Certainly... but why? Sounds like an awful combo. To each his own, I guess.

Yes. But why? The pleasantness of sipping on room temp cognac and share conversation is quite satisfying. Vodka is very pleasant in its own mixtures of fruit juices or as a martini. It sounds like overkill to mix these too potent alcohols. Especially since One would be spending considerable amt of money for the quality. Is acheiving drunkenness the only purpose One is seeking? If so, then any cheaper booze mixed would serve. Good quality is to sip stay intoxicated but not falling down drunk or out of control. Foolish twit

I've never heard of problems mixing liquors due to negatively reacting toxins and I've been in the booze biz a loooooong time.

You're fine to mix them (I assume you mean drink both, but separately, in one night; not pouring them into the same glass and drinking them at the same time).

They won't burst into flames or explode, if that's what you're asking.

I don't know. but I just wanted to say your picture of Totoro is so cute!

uhm its not a good idea