i smoked weed between the ages of 18 and 23; i stopped weed entirely by 28, kept doing drugs on and off until about 30.
i feel that drugs have helped me become a better person; i find their effect both therapeutic and enlightening .. although i also believe this might not be experienced by every user.
my drug list is: weed/hash, cocaine, mushrooms/LSD (don't like, rarely did it), extasy.
first off, i think it's vital to experience drugs as a pleasurable substance because we, as a species, use them profusely - not just stoners, drugs have been used by every civilization to have ever existed.
pretty much every person we hold dear, every artist, every creator, has used drugs and they often are part of the inspiration behind the work. using them allows us to understand that part of society.
second, i truly believe that drugs show you how your mind works, aspects of yourself you are otherwise incapable of perceiving. i'm not a fan of getting all spiritual but essentially, that + science.
i do believe that drugs do harm mostly through being subjugated by a black market, through having no education associated, ignorance, bad quality, and crime.
(consider that for a long period of time in europe, you could go to the shops and buy anything, coke, heroin, opium .. you'd think we would have a worse social situation, but we didn't)
i also believe that drugs, like anything else which is powerful, can cause big problems unless there is a social safety net; that you should know better (learning through your peers) than to take drugs in some situations, be they when you are required to be not-on-drugs, or when you are in some states of mind, or simply to learn if you are a person who should not take so and so drugs.
i have what is called an addictive mentality; i like things i like and i like to have them always. (not just drugs)
however, i have never had a problem with addiction - call me lucky? maybe it's due to my being in touch with my feelings, which leads to me know when to not take the drug. maybe it's because i was moderate, because i always completed the come-down cycle, because i did not associate drugs with psychological need, or another long list of "things which are no-nos when it comes to drugs".
i've seen people get messed up with drugs, people who could not handle themselves, people who got mad cravings, people who behave like idiots as soon as anything goes inside them.
that's it. this is my little speech. there is no conclusion. you decide.