I have, and not just for meth, but for heroin, and alcohol, and nicotine, and caffeine, and all sorts of other drugs.
Have you seen first hand what it looks like when somebody takes a women and fucks her in front of her husband, then tortures her, and finally cuts her head off?
What about a man being thrown alive into an acid bath?
No? Would you like to see that? Can you imagine what it would be like to be in their shoes? Just head South of the border. Ask for the Zetas. Ask for the families of people who have been kidnapped and turned into slaves.
This is the _reality_ of drug prohibition. Entire neighborhoods living in constant fear.
Methamphetamine can cause some damage to the human body when abused. So can water. The difference between a hit of meth in your hand and a punk standing over your head with a rifle pointed at your temple should be obvious. The difference between a hit of meth in your pipe and the unrelenting human suffering that goes on in America's overflowing prisons should be obvious. It is the difference between personal choice and the consequences thereof, versus violence imposed upon you by another, completely out of your control. It is the difference between freedom and prohibition.
I could kill myself by overdosing on a number of substances right at this moment, but I don't. It's because I know better, not because there's a law against it. It is far easier, cheaper and more humane to educate a population and provide them with the healthcare and counseling that they need than it is to deal with the horrors that are going on around you today due to prohibition.
Compassion and understanding and freedom will lead to a better world.
Prisons and prohibition perpetuate suffering.