Wouldn't recommend smoking Amphetamine
Sulphate - you'll get some nasty shit in your lungs! The safest way is probably the way you did it when you were younger, or wrapping it in a rolling paper(the thinner the better) and swallowing; the quickest and possibly the most addicting way is to shoot it; the 'best', and probably nastiest way is snorting
it - it'll burn like hell, but that passes. Dabbing is also o.k., but the taste is grim, and you will damage your gums and lining of your mouth.
Amphetamine sulphate isn't the same as meth
. Meth is virtually unknown in Briton, so please check the location of the poster before advising!