A lot of people find that alcohol makes their symptoms worse. I guess it's a personal thing same as any food/drink. I also guess that if it doesn't make you feel worse then it isn't making your Crohn's worse (though I could be wrong about that).
As for narcotics, they help me in my time of need but I use them VERY rarely. I think the danger is if you are using them regularly as they can a) be addictive b) mask pain so your Crohn's get worse without you knowing and c) some can cause constipation which could aggravate things inside.