I tried a joint once but since I don't smoke, it seemed like inhaling fumes coming out of a car exhaust!!! Needles to say I was coughing my ass for half an hour....
Anyways, weed is not dangerous I reckon (alcohol is 100 times more deadly, and it's legal!). But that's it basically. All this chemical shit (ecstacy, amphetamines, cocaine, acid, etc.) fucks you up hard in the end. The very few people I know that do drugs systematicaly are just plain miserable (same goes with alcohol addicts). I'm sorry for them, cause they are in really bad physical and psychological state 24/7. And that's sad.
In a few words,drugs are shite. You want to get high? Put a record on, play football, have sex, read a book, just do something else than that. I hate preaching, but I reckon this to be serious so...