Effects - Confused by effect

[Fatboy03]

Swim bought a gram of coke just the otherday. Now swim did a small line of it and just thought it was great. Then swim did the rest of it the next day and noticed that when swim did it in the morning it wasn't bad but kept doing it throughout the day and the effect kept getting shittier and shittier until the last line swim just dumped out on the plate and did the biggest line swim has ever done. Swim felt nothing but gipped out off money. Doesn't do coke much but just a few times. Swim expects tolerance after awhile but not the first day in the past 6 months. What would cause the high getting worse in just one day?