It's not necessarily about drugs. There is mention of it, but the song is generally about living in a world of joy, where you don't have to question the fact that you can only be truly happy once you have a perfect life. He's putting into perspective what makes his life perfect, this could be drugs, as suggested by WaxWings, it could be a lover, or the feeling of success, anything that makes you happy in life for certain is perfect in this case.
It's not necessarily about drugs. There is mention of it, but the song is generally about living in a world of joy, where you don't have to question the fact that you can only be truly happy once you have a perfect life. He's putting into perspective what makes his life perfect, this could be drugs, as suggested by WaxWings, it could be a lover, or the feeling of success, anything that makes you happy in life for certain is perfect in this case.