It is true that smoking is bad. So is it that drinking is bad.
Is this construction possible?
closed as unclear what you're asking by Chenmunka, snailboat, user10395, jimsug, Danubian Sailor May 23 '14 at 7:20
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So is/does X, meaning X is/does the same, can only be used when X is the subject of a proposition.
But the construction It is true that [Y] represents
It is not a "real" subject but a "dummy" subject, only put in so [Y] can be postponed until after true. Consequently it cannot serve as the subject of so is/does X. You have to say: