I agree with Skrewy on a few aspects, although I'd just like to add something to the conversation.
Drugs can indeed be life-changing. Essentially, drugs make you reach different parts of your brain you wouldn't normally reach. These parts aren't accessed on a routine which in other words means they've not yet been established directional links to the conscious part of our brain --by not doing so, they open a new precedent. Suddenly, the value and importance you give to conscious facts you become aware of in life is rendered non-effecting to this newly accessed parts of your brain. This explains why sometimes a single trip can completely change the way you perceive A or B or even the way you think of yourself. It is because you have no way to measure value and affluence of said access established within your brain that you can judge.
Metaphorically, it'd be like dropping a cow from midair into a field with around 900+ and no one --not even the dogs-- would realize that's a cow and not a dog. They may know it's not a dog but they do not know that it isn't a dog either...thus, they're left with simply accepting it.
On the account of drugs, I'm on a hiatus. I'm 23 and have had huge fun with them. Mushrooms, Acids, Coke, Bloom and variables, Weed, MDs, you name it. It's been a good roll and it has indeed helped me reach a few perspectives I'd of not reached (at that given time and under those given circumstances of my life) otherwise.
P.S:. Yes, you can experience the "kick" drugs give you through meditation alone. In order to do that, you need to start training your brain on the unconscious level, though. A good way to start is giving 10min of your waking-up time out. In those 10min, force yourself to remember what is it that you dreamt and write it down or record it somewhere. Start decoding the native language of your dreams, of your creative creations. Once you've grasped how your brains projects, take a few steps back and relate to that language whilst meditating. After that, patience my dearest, patience you must have and patiently you shall remain.
Yeah I have to say that LSD was the most life changing event of my life thus far. It just makes you look at the human life and cycle from a third person view. To me, human life just seemed so shallow and pedantic. I took a shower and I thought about my whole life and all of my relationships. I came to conclusions I never would have when I was sober. I am a very lazy and laid back person when I'm sober, so I can be pretty irresponsible. When I was in that shower, though, I swear, it was the most powerful moment. I was almost brought to tears because I kept looking at my life and asking myself "WHAT THE FUCK ARE YOU DOING?!?!" I almost quit smoking weed forever because of that. I didn't stop smoking, but I'm much better off after that trip.
After watching a movie called Waking Life (which is amazing... I recommend this to everyone), I've been trying to remember and record my dreams in the morning but sometimes I just can't do it - I've been having trouble waking up lately. Anyways, I've really been hoping to lucid dream sometime. I've heard you can unlock timeless secrets in your head. I like to meditate now, but usually that just consists of 10 minutes of just clearing my head of anything and everything.
Mister, it's hard to hear that about your friend. However, realize that drugs affect everyone differently - everyone's body works differently so the way drugs work in your system is different. This means that people who may be naturally predisposed to anger (even if they're perfectly normal when they're sober) tend to be more angry and aggressive on a drug where they can't control their limbs (loss of motor skill) or are confused and they don't like it. I've known some people who've smoked weed once, and hated it. I'm not trying to push it on everyone. I'm just saying that it's been a positive experience in my life.