“… what drawbacks can one expect when doing what should not be done?”
Categorically
Ekaṁsena Sutta (AN 2:18) (excerpt)
“Given that I have declared, Ānanda, that bodily misconduct, verbal misconduct, & mental misconduct should not be done, these are the drawbacks one can expect when doing what should not be done: One can fault oneself; observant people, on close examination, criticize one; one’s bad reputation gets spread about; one dies confused; and—on the break-up of the body, after death—one reappears in a plane of deprivation, a bad destination, a lower realm, hell…
“…Given that I have declared, Ānanda, that good bodily conduct, good verbal conduct, & good mental conduct should be done, these are the rewards one can expect when doing what should be done: One doesn’t fault oneself; observant people, on close examination, praise one; one’s good reputation gets spread about; one dies unconfused; and—on the break-up of the body, after death—one reappears in a good destination, a heavenly world. Given that I have declared, Ānanda, that good bodily conduct, good verbal conduct, & good mental conduct should be done, these are the rewards one can expect when doing what should be done.”