An expert opinion on drugs??

I need an expert opinion on drugs, any celebrity or perfessionalist's feelings on drugs, please answer A.S.A.P!! thanks so much!
I don't know what a "perfessionalist" does for a living, but I'm sure they can't lend a hand you. A pharmocologist would be able to help you with any textbook question you may have. Pharmocology is the the science dealing with the preparation, uses, and esp. the effects of drugs. However, I also suggest that you ask the opinion of populace who have used the drug(s) before!

If you introduce a chemical/drug to your body, it will produce a change contained by you. It's effects can benificial to your health/happiness/well-being and it can cure you. It can also be habit-forming, death can also be a result. There are no guarantee drugs, as we all have our own individual chemical foundation!

(Try adding details...what KINDS of drugs would you like to learn more in the order of?)
Drugs are not worth it. They enjoy harsh penalties for drugs in the sprite system. Whatever you do dont sell drugs!!! A little pot is ok but if you get caught with anything worse you will be going to lock up for a while. Drugs are bad. Can you be more specific? An opinion on the WAR on drugs? It isn't working and it is causing more problems than it is solving.
"Drugs are bad mmmkay. You shouldn't do drugs. Marijuhwanna is bad mmmkay. You shouldn't smoke marijuhwanna." -Mr. Makey from South Park