This couldn't be more wrong.

Im Anti Alcohol but this is just plain stupid
To answer the question tho its Meth heads hands down.
You cant eat or sleep,it rots your teeth,makes your hair fall out and ages you.
shyt be sucking the life outta cacs.
My job literally takes me to small towns where sometimes I've been in the company of neighbors or people in the town who use meth and other substances that are waaaayyy more taboo than weed and you would have no idea whatsoever about their narcotic usage. I've also seen the stereotypical meth-head who you could spot from a mile away. The common-thread difference between the 2 groups? One consumed alcohol at an abnormal rate while the other didn't. I'm not quoting any studies, media images, or articles or any second hand info sources, this is just from living in different pockets of America and being a naturally explorative & fearless dude who loves to learn as much as I can about how people live differently.
You also conveniently skipped passed the part where I mentioned personal hygiene. Addicts who get to the point where THE ONLY THING THAT MATTERS AT ALL is their next hit also forego simple every day hygenic habits because that stuff is nowhere on their mind. Eating as well, so the obvious nutrition deficiencies contribute to them looking like zombies. I need to add this because the media misrepresents it as some of these drugs will have you looking like sh!t for the simple fact that you use the drug. This is not the truth, the addicts who just need a fix but can avoid getting to a point of ultimate obsession and will keep the other aspects of their lives going normally won't exhibit those physical deficiencies that most people associate with drug abuse. However if you are within the percentage of the population whose addictions can completely consume your life, then yes, you will become a zombie but not for the simple "A leads to B" & "this is what all of them look like and become" rhetoric that the media pushes about pretty much everything.
Like I said I'm simply reporting what I've seen from being in different parts of the US. No point in asking for deeper proof because I'm not one to give away any aspects of my personal life to anonymous people online. I offer simple anecdotal evidence to my thesis that while most narcotics shouldn't be consumed or abused, nothing ravages the human mind and body like copious alcohol consumption. Over time alcohol by itself will have your body as broken as if you mixed alcohol and narcotic abuse together. I know of no drug by itself that will rip you apart like alcohol will by itself.
You can believe me or not, I don't care either way. However I am a person that when life experiences teaches me different than produced from God knows where stories and images, I'll always challenge them because people ignorant to the real story deserve to hear the realness from people who's lives have intersected with these topics.