What US President carried a small but lethal dose of a drug with him for years, in case he ever felt it was time to take his own life?

Can't wait for the answer and source on this one! I'm at a loss.

"Theodore Roosevelt had carried the lethal dose of morphine with him for years. He had taken it to the American West, to the African savanna and, finally, down the River of Doubt--a twisting tributary deep in the Amazon rain forest. The glass vial was small enough to tuck into a leather satchel or slip into his luggage, nearly invisible beside his books, his socks and his eight extra pairs of eyeglasses. Easily overlooked, it was perhaps the most private possession of one of the world's most public men."
Time Magazine

Excellent, Georgia, and Time is my source, too. Reading the article will show that TR was very close to using the morphine when in South America.

Good job.

I did notice that DG. It was quite an interesting article.