I'm pretty suprised GB didnt include me in the experienced drugs user list...
but yeah; a list of drugs:
Ketamine
2CB
Aceeeiiiid (LSD)
Anthetamine (speed)
Cocaine
MDMA
Pills
NOS (laughing gas)
Marijuana
Alcohol
Salvia (x20)
a recreational lsd user, (weekly/ bi-weekly) also a avid fan of ketamine, and maryjane at the weekend (i would smoke more, but it does make me lazy, and i do have to work

)
so yeah, drugs affect people in different ways -
Ketamine, well, its not just for horses.
can make you lose control of your balance, disorient you, and basically cause havoc with the things you take for granted (such as walking, on k, its called the moon walk, cause its really bouncy and light). alot of fun. i have also experinced 'big' syndrome which is where everything seems massive (e.g friend held up his mobile phone, n said "why is my phone so big?!" we all looked at it, and his phone grew like 10 times the size it was - wierd!)
NOS (laughing gas)
will be the hardest you would probably ever trip, for just £1 a balloon. buy balloon - inhale gas from balloon - spend next 2-5 minutes feeling everything. buzzing hard, and tripping insanly. huge amounts of fun, and not very dangerous either.
Anthetamine (speed)
proper shit, and dirty. makes you slightly buzz, wanton to socialise, but generally very dirty, and cheap.
Cocaine -
expensive, short lived, and addictive. enough said.
Pills/ MDMA
pills contain MDMA (which is pure ectasy) but also contains little suprises which it has been mixed with, say, some anthetamin (which actually goes well with MD). ez to take, and canuplift mood if feeling rubbish/ tired.
Acid (LSD)
LSD asks alot of universial questions, but it can also just be alot of visual fun... such as patterned visuals, actual world changing (such as 1000's of giant silver crosses), fluorescent purple lightinin (imagine a brain lamp) flowing from your fingertips to the nearest object... pictures moving on walls, and i get alot of 'flourishing' where every natural thing (such as flowers, and ferns) will continuiously grow, and the re-grow... by far my favorite weekend drug... can make you very emotional...
2CB
pretty expensive for what you get, more of an enhancer. caused some head-rush like coloured visuals (when you stand up to quick, you get those coloured patterns like flash across your vision?) and generally more socialble.
Marijuana
for everyday use, how do people not smoke it?
-gaaah gritty weed is back in england! (weed coverd in little crystals to weigh it down and make it look better, but it actually ruins the weed)
Alcohol
expensive, tastes rank (most of it), can make you sick, disrupts sleep, rank feeling in morning, can be addictive.
Salvia (x20)
i've tried smoking salvia 2 or 3 times, and to me its just a toned down version of weed. i didnt really get high, it just got me disappointed.... remember, itf its good, its probably illegal

there are my short reviews on those drugs...