Is watching pornography a cause for a setback in work? And thank you.

Looking at images of 'awrat (private parts) is forbidden. It does not nullify good deeds in a way that obliterates them, except in the case of disbelief (kufr). However, it diminishes the reward of good deeds if it accompanies them, such as Hajj and fasting. Sins may also nullify the benefit of good deeds if they outweigh them, in which case their perpetrator will be purified in the Fire and then enter Paradise, or Allah may forgive them and admit them into Paradise.