Suicide

Suicide is the act of self-terminating a life. It is usually done when one suffers such a depressive state of being that they can no longer stand to continue living. Sometimes the act of sacrificing one's self for the sake of others' safety and well-being is called this.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf novel, Empath took Baby Smurf with him to Mount Vesmurfius with the voiced intent of taking Baby Smurf with him to end the suffering he had endured by Papa Smurf leaving him in Psychelia during the past 150 years of his life. As it turned out, Empath was expecting Papa Smurf and the other Smurfs to come because he wanted Papa Smurf to prove how sorry he was for what he did to Empath, and thus the suicide attempt was averted, though with Brainy trying to step off the ledge and breaking Empath's concentration in keeping himself and Papa Smurf afloat in midair, all three of them ended up falling down the chasm toward the fiery lava lake below. It required Papa Smurf using his magic to rescue Empath and Brainy before they reached the lake while Papa Smurf created a shield around himself to protect himself from the lava.

Hero: The Guardian Smurf stories
In the HERO: The Guardian Smurf story "Toll Of A Loved One's Loss", Hero decided that he was going to end his life so that he could be with his first wife Wonder after she had died. Papa Smurf as well as Smurfette, Saviour, and Hawkeye then traveled to Mount Vesmurfius to dissuade Hero from committing suicide, with Smurfette proving that she still loved Hero by kissing him.