b999: I'm just gonna lay it out here. This is a little embarrassing for me, but whatever. I've taken amphetamine daily for over 15 years. I've abused it in heavy doses for over 10 on a near-daily basis. I've abused methamphetamine as well (simultaneously) every day nearly without fail for about a year now.I look younger than I am and am in absolutely fucking shockingly good health for someone who lives the lifestyle that I do. I mean 5-10 years younger. Yes, really. However, I have always -- somehow -- had a bizarre near-immunity to substances. I've taken lethal overdoses and gotten up the next morning. I don't know why, maybe super man gave me his kidneys or something, who knows. Your mileage may vary, is my point.Also, this is not to say I have not suffered damage... I have suffered a very noticeable and problematic amount of damage to what they call "executive brain functions," as well as a myriad of other things I blame on my amphetamine abuse.I eat a very healthy diet and try (but often fail) to do things like aerobic exercise and strength training. I'm sure that's helped, if nothing else. The only physical damage I seem to have suffered is that my hair sucks now and I have a heart thing that comes and goes but has never been diagnosed. 15 years ago I had gorgeous, soft, vibrant hair. Today it's... I don't know. Mediocre. It's my understanding that sleep deprivation can cause this. Well, I've had a decade of some seriously fucking severe sleep deprivation -- it could be the drugs themselves, but I don't believe so.In short: that whole aging thing? Yeah, I don't know wtf they're talking about. I mean for real, I have absolutely no clue where the fuck they got that shit. It sure hasn't happened to me or anybody I know, but that's all I can say. I think mostly it's the sleep deprivation combined with severe malnutrition. When you first start doing the drug, you don't need to sleep. Or eat. Or even drink much, really. Like... you don't need to almost ever. As in you can easily go an entire week without eating or sleeping and barely drinking much at all, and as long as you keep taking the drug, you won't want to either.I think that may account for the people who end up aging 20 years or something in 6 months. Maybe if I went 6 months without any sleep or nutrition at all I'd look like I was dying too. Who knows. At clinical doses, however, there is little -- if literally any -- damage done to your body. There's also no discernible damage done to the brain, basically. I define clinical as sub-50mg daily. If you want references, see any study on ADHD treatment with amphetamines.Oh, almost forgot. I have all my teeth. And no cavities. They're almost perfect actually. And yeah, chewing gum stimulates saliva production, which would help.