My last serious relationship is definitely not a fog- but it had alcohol as a huge component to it. Long story there but I will just say that my judgment was very clouded.
In a number (how many?) of lesser relationships, alcohol also played a role or was basically the only reason I got into it- sort of drifted into it, usually. A few dates or sleeping together and all of a sudden....relationship. Ugh.
It is so much better- infinitely- to have a real, sober, deep, committed, clear relationship where both of us are 100% in.