Because it’s not just a nervous system stimulant. Amphetamines interfere with our body’s functioning in more ways than we’ve even worked out yet. Yes, overstimulating the brain and cardiovascular system causes dramatic damage (you seldom meet an old meth user), but you’re right that all meth users look old.
A recent study in rats found that meth increased production of fats called ceramides that regulate cell aging and death by way of inflammatory cascades. Sort of like making all the cells in your body feel very sick, and very old on a chemical level. More complete details below.
Admittedly rodent models don’t always translate well to human models, especially where immune systems are involved, but for an effect so dramatic and universal (meth causes premature aging and death predictably in every user), this alone is enough information for my purposes.
https://news.uci.edu/2015/02/11/uci-italian-scientists-limit-accelerated-cellular-aging-caused-by-methamphetamine-use/
It increases your skin temp and makes your skin more oily. You get pimples and these almost caustic scabs. It makes you stink and lose weight at an alarming rate. Your eyes get sunk in and you start to act erratically. You stop washing or even changing your clothes. Your hair gets greasy even if you take twice the normal showers.
Was addicted to shooting meth for a while, too long. I can spot them, or often smell them, from across a room now. Their behavior and just the health of their face is a dead giveaway. You can not sleep on meth, so they look very tired. You cant really eat either so they look unhealthy and drop weight like crazy. They also talk and go into detail incessantly, they send pages long texts about nothing.
Also, meth heads love flashlights and Bluetooth speakers. No idea why, but they can not resist either one. A combo flashlight/ Bluetooth speaker is the holy Grail to a meth head.
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