Drugs, speed, acid, weed, has taken away lots of great musician either by death or their playing career away. Pills popping was widely used in the 60's as a way to keep musician awake to finished long hours of studio recording. I just heard the radio documentary on BBC on Keith Moon was so stoned when he recorded the song Subsitute with The Who , he accused Pete Townsend of using another drummer as he could not remember he played on that song.
Singapore laws on drugs is very very strict, lots of old 70,s rocker does not even do drugs here now. Even when you take any form of drugs aboard other countries and if you are unlucky when they does a random urine check and tested positive for drugs , you will be fine or jail or both.
My advice to all you young friends is best not to try any form of drugs , it is not worth the risk. I can tell from experience at that moment anything you play on your guitar will sound fabulous but can you remember what you played after the drugs effect wears off
Lucy in the Sky with Diamonds