Effects - Dph question...

[TheGuy]

Alright, so. SWIM and a couple friends decided to take some benadryl. he read up on it, to see the effects and everything. finally they get it. this is all of their first time doing it.

SWIM decided to take 17 - (160lbs)
friend1 decided to take 18 - (203lbs)
and friend2 decided to take 20 - (235lbs)

alright, so boom. its been an hour, SWIM starts to feel the effects. But nothing special. 1hr and 30mins he is still feeling the same feeling as when he started. (he saw stuff move in the corner of his eye from time to time, and a little heavy. but other than that, he felt completely normal, like able to drive normal)

friend1 crashed
friend2 is totally gone, like out of this world. looking at me like im dumb when i talk to him, and he kept tryin to get the "controller" from my hand. but we were outside and i didn't have a controller... =o and i had to help him to the couch so he could sleep. SWIM stays up a little longer then crashes.
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ROUND2

SWIM and friend1 decide to do it again.

SWIM decided to take 21
friend1 took 21 as well.


an hour and 30 mins later, SWIM is seeing more hallucinations then before, but still. he can control his mind/actions/speech.

friend1 yet again, was completelyyyyyyyyyy gone. like seriously, he was tripping. saying that there were spiders all over his bed. and SWIM tried to convince him, it was a hallucination. and he did a bunch of stuff, like totally retarded stuff.


so anyways. sorry for writing soo much. but SWIM really wants to know whyyyyyyyyyyy dph doesn't affect him as much as others?..