I'm 21 years old. I've used marijuana maybe 50 times in my life. Sometimes I get paranoid or anxious. Sometimes i feel, if only very slightly, as if Huxley's 'Doors of Perception' have been opened a little bit. In other words, i feel as if I'm seeing reality in a truer, more wonderful and beautiful way than i otherwise would.

For most people marijuana is a mostly positive experience. For most it is not addictive, has virtually zero adverse health affects when used in moderation, and doesn't lead to destructive behaviour. It's not for everyone though: if you don't like it, don't do it.

Some people develop an addiction and psychological problems to and from marijuana use. These problems originate in the particular user, not the drug itself. Some people are susceptible to addiction and psychological problems. People become addicted to many different things (food, drugs, TV, etc.), while the rest of us might try alcohol or drugs without facing any real problems whatsoever.

Anyway the point is: get your information from an objective source. Use your own common sense.