Answer:
Well I didn't know you could sniff it but after taking amphetamine a large amount of dopamine is released, this is the brains main pleasure chemical.
From examination a person will seem unusually lively with abundant energy, very talkative, euphoric and have dilated pupils. Exaggerated and repetitive motor functions will also be apparent and the concentration level of the individual will be compromised with short term memory being affected. Lastly you may notice perspiration even when at rest.
My advice? Don't do it, tell a few jokes instead and save you neurons for later!