In concept yes I support this. Who is society to tell a terminally ill patient in excruciating pain that no they cannot opt to end their suffering? Let individuals make their own choices. And just the same as a doctor can perform an ultra-risky surgery with slim chance of survival I see no reason why a willing doctor couldn't be allowed to help these people die in less pain through medications.

Oregon already has such a law and it's quite successful and the worst fears of critics have not come true. Some foreign countries have it as well.

The key factors to me are

a) voluntary - both by the sick person and by the doctor

b) and terminally ill and in terrible pain - meaning not just a simple gee I'd like to do it. Good reason.

You own your life and your body. Therefore it is up to you what you do with it and you get to decide if they want to end it. There are plenty of people out there with really bleak situations in life and it is simply unkind to force them to carrying on living that way if they don't want to.

Nobody should be forced to live if living is against their will.

While it is true that ever-advancing technologies are providing greater opportunities for previously unrecoverably ill and injured people to improve their situation, there are still many who have no such recourse and shall die soon: either in horrible agony for weeks, months, maybe even years, or on their own time and with their own acceptance.

If somebody has, say, locked-in syndrome or brainstem glioma, and makes clear their desire to be spared undue suffering, it is morally indefensible for somebody not in their position to make the claim that all lives are special or that people should live until their time is up naturally. Only the individual in question is capable of making that call; twisted moralistic attempts to say otherwise be damned.