I had two small loads out of my bong. Held the first hit for 30+ seconds. Imediately upon exhale the room began to spin and I gained 400 Lbs. After a few minutes I was able to put the other pre packed bowl in and after smoking it in the same fashion was nicely toasted for about 30 minutes. I relaxed in a recliner and listened to a Moody Blues concert recorded in a small club in France in 1970. The high shut me down physically but did a good job of opening up the head. No unpleasant after effects at all. As a quick chill out I give it an eight out of a possible ten.