My only involvement with "Meth" was in the 1950's...
https://en.wikipedia.org/wiki/Denatured_alcohol"Methylated Spirit" in the brass Burner, to heat the water in my Mamod Stationary Steam engine....>>>

It never did any harm to either me or my Care Bear....

...!
...whereas, "Crystal Meth" is the stuff which modifies Humans brains...
...and is not recommended for Care bears!
The bad Meth...>>>
https://en.wikipedia.org/wiki/MethamphetaminePaul....

...!
Just look at those prices!...>>>
http://www.mamod.co.uk/shop-categories/sp4-steam-engine...Mine cost next to nothing in 1950! (I have two of them).