Do not underesitimate how fucked up alcohol and weed can make you.. Especially if you get really pissed beforehand.. Altho if you are really drunk and then smoke, only 2 things are really gonna happen.. Either you blow chunks, you you pass out after thinking "IM REALLY HIGH!" for about ten minutes.
Remember, if you're going to combine the two, the best way to avoid nausea is remember this simple little rhyme..
Drinks and then grass, you're on ya ass!
But weed then beer, you're in the clear.
Although, after a night of drinking, I always pine for a cone.. It seems to fix that alcohol comedown for me, and the morning I wake up refreshed and alot better ithan if I didn't smoke.
But the answer the original question.. If you aqre not a common smoker.. the after effects of weed, epsecially the next day, you notice you're a bit doughey and slower than usual.. Usually only lasts half the day at most. That copmbined with an alcohol hangover can be pretty uncomfortable. But seeing as I smoke every day, I don't get that.
Also, you may want to question your weed. What is it? If it is hydroponics, you might want to make sure the source/grower is flushing tyhe weed.. You may be smoking the chemicals still left in the plant to make it grow in 6 weeks.