Easy peeps.
Remember addicts that bad are very few and far between.
Methamphetamine wont take off in the UK simple because we have speed (base in its pure form which is incredibly powerful!) which is more or less the same thing.
There maybe a small minority who decide to smoke it (crystal meth) but smoking speed in the UK has been done since the 60's so its nothing new!
I personally think its nothing to worry about but you can bet your mortgage on the fact there is some twisted scientest making some new sort of designer drug to out do everything thats there currently.
It will happen.