perfectly safe combination. You should have a great time as the marijuana high compliments the opiate high you will get from the vicodin. When I do opiates I prefer to have some MJ on hand as it may help you save a few of those vocdins for tommarow!
Read the rules. Use the Search Engine. You should probably refrain from making new threads if you haven't done either, it's going to result in more infractions. Seriously, this is like, the 4th thread of yours I've had to say this in.