SEU Consulting Revenues Discussion

I’m working on a management discussion question and need an explanation and answer to help me learn.

This is the topic of discussion, I want a simple and tidy answer

You have a long-standing consulting relationship with a large consumer products company. This company represents 50 percent of your consulting revenues and is clearly your most important client. The CEO has called to ask you to commit a
signifcant amount of time over the next couple of months to assist with a large merger project. The company is merging with a large conglomerate whose primary business is the sale and distribution of tobacco products. The CEO is relying on you to
assist in facilitating a smooth integration of the two companies.
You promised yourself that because your father died of lung cancer, you would never work for a tobacco company. Is there a way that you can accept the consulting assignment and still
keep your promise to yourself? How will you handle this dilemma if you decide that you cannot work for the tobacco company?