Yeah once I went to a bush doof while suffering from a cold, which mainly consisted of a sore throat and a runny nose. I dropped half of an E and I'd say about 20 mins later my sore throat was almost gone, you could barely feel it and my nose stopped running. When I got home I noticed though that my sore throat had come back just as bad as before I went out and the same thing happened with my nose too, so I'd be really careful if you go out and drop while you're still sick. If this isn't convincing enough just go to the RDC message board and read one of the messages on there from the weekend.