SC Doubt

[sainaa794]

With the evolution of technologies such as cloning, scientific community leaders mandate that researchers consider the ethical questions associated with their field of development, as it is a part of their professional responsibility.

1)consider the ethical questions associated with their field of development, as it
2)considering the ethical questions associated with their field of development, doing so
3)have considered the ethical questions associated with their field of development, as to do so
4)consider the ethical questions associated with the field of development, as doing so
5)consider the ethical questions associated with their field of development, as to do so

confused between D & E. please guide.
Source: The Economist

[Sage Pearce-Higgins]

The only difference between D and E is 'as doing so' versus 'to do so'. Which is correct between the following sentences?

Smoking is bad for your health.
To smoke is bad for your health.