The sentence "it is harmful" is grammatically correct and can be used in written English.
Example: "Excessive sun exposure can be harmful to your skin."
Isn't it wrong to allow its continued use in the absence of proof that it is harmful?
"But we are sure that it is harmful".
And by substituting special interests for the public interest, it is harmful to democratic expression".
This explains our confusion about smacking, and your next misconception - that it is harmful and ineffective.
We need to accept we know now it is harmful and let it go.
Worse, we also won't get feedback to tell us if it is harmful.
But it is harmful – and potentially disastrous – in the liberal democracies.
It is harmful, incredibly harmful to the United States of America".
But it can be just as rewarding as it is harmful on physical and mental health.
The presence of a chemical in the body, however, does not necessarily mean it is harmful.
Of course it is harmful and of course it is addictive.
