On: Microsoft Alternatives project (MAlt): Taking back...

[mises]

"right to life, liberty, and the pursuit of happiness"

But more importantly, the question is "where does it say the government can stop be from breathing?".

[the_why_of_y → mises]

The sentence you quote is from the United States Declaration of Independence, not the Constitution; it is not law.

As to your question, the Fifth Amendment says:

No person shall [...] be deprived of life [...] without due process of law

If this is a concern to you, there are more civilized countries on the globe whose governments do not enjoy such powers.