I've smoked and drank enough to the point I felt really light-headed, dizzy, and really spaced out but the worse that ever happened to me was I got a panic attack (my heart started beating really fast and I felt 'trapt')... Though I found I dont get panic attacks if I also drink 3 - 6 beers anytime I smoke more then normal... Guess the beer acts as a depressant or something.


EDIT:

Though I have found it curious how some people get sick off the combo of weed and alcohol... It always did the opposite for me (made me feel better).. But I remember smoking out with my bro and his gf and me and my bro had almost a whole 750ml bottle of tequila... Me and my bro were fine (though really fucked-up) but his gf, who only had like 3 shots, spent all night in the bathroom throwing-up.