Ooh, I did this once... It was great, I put .5 grams each on 2 firecrackers, and ate them an hour before we left. Kicked in as we were going through security, but I didn't have any problems, as it was 5 am, and everyone had bloodshot eyes (either that, or they all ate 'em too!) and it peaked during take-off... AMAZING. Bring music

The rest of the day, I had an afterglow kind of haze, and it was great (esp. in Florida)