It is uniformly accepted amongst the Muslim Scholars that it is not permissible for a Muslim to commit suicide to relieve himself of a financial hardship, painful illness that is terminal or any other thing that has happened to him. Suicide to relieve oneself from these types of hardships is without a doubt Haraam(unlawful). There are sayings of prophet Muhammad (peace be upon Him) reported in authentic books of Hadeeth that imply that a person taking his own life by consuming poison or piercing himself or any other means (that result in his death) shall result in him being punished with that same mode of death until the Day of Resurrection. Some of the scholars have understood that the person who commits suicide dies as a Kaafir or an unbeliever since the one who commits such an act has gone against the teachings of the Quran which says, "Ask Allah for help with patience and prayer".  Prophet Mohammed, peace be upon him said: None of you shall wish for death, but if anyone of you is going through hardship, pain, and suffering to make him close to death, he should say: Oh Allah, make me live as long as life is good for me in my life and in the hereafter, and take my soul if life is going to increase my bad deeds (i.e. in this life and in the hereafter).  This is the kind of trust a person should have in his lord to make such decisions under these circumstances. Without a doubt, a (true) Muslim could never reach the level whereby he commits such an act of taking his own life.

A Muslim has the choice of not accepting the artificial life sustaining measures such as a respirator or tube feeding, incases where there is no hope at all to live without these devices. . There is no purpose of life for a person to be on such devices when he/she is technically dead.   He (or his/her custodian) may request to come off these artificial life sustaining devices and wait for his time of death as fixed by Allah (Glory be to Him).  Allah forgives his sins for his sufferings as long as he/she does not loose his/her patience, by accepting the will of Allah.

Here is a verse from Quran, {And do not kill yourselves. Surely, Allah is Most Merciful to you}, [Soorah an-Nisaa., Aayah 29].

It has been narrated about prophet Mohammed saying[((Indeed, whoever (intentionally) kills himself, then certainly he will be punished in the Fire of Hell, wherein he shall dwell forever)), [Bukhaaree (5778) and Muslim (109 and 110)].

In summary, Islam has forbidden all forms of suicide killings to terminate own life regardless of the method used.