You could understand it, but you'd still be off base grammatically. Havoc is a chaotic condition and has no referent to olfactory experience; further, the verb to "reek" does not take an indirect object without the preposition "of". You could say that the havoc reeked of sewage, or the plant reeked of havoc (with a little poetic license). But "reeks havoc" is meaningless.

A