Mmmm, I beg to differ on your list by varying gradients.eh...not really. Those are survival drugs.
My insulin keeps me alive. Pot, alcohol, cocaine, PCP, meth, heroin, etc. are not needed to survive. They are "luxury" drugs...I don't really know what kind of luxury they bring, but they are not necessary for survival.
Tons of people use Med. Marijuana for life saving purposes. A close friend of mine has cancer between his small and large intestine. After the surgery to remove it, the Narcotics they gave him for the pain clogged him up totally. Dr. suggested Med. Pot (this was in 1997). He used it for 6 months and admitted to me that it saved his life. He ain't the only one.
Meth - there are more refined amphetamines that are plenty life saving.
Cocaine - had it in my eyedrops for eye surgery.
Heroin - just partially refined Opiates. Almost every post-op patient would disagree with you there.
In any case, medications are rarely for "life saving" applications. They're way more for maintenance. And without them, your drumming would suffer big time.