Cancer can be caused by both environmental and genetic factors.not smoking does not guarantee immunity to cancer. what does the second sentence do?

It means that even you smoke or not, you shall still suffer from cancer

Toward the start of the story, Rainsford's demeanor is genuinely chilly toward the creatures that he chases. Rainsford cherishes chasing, and he feels no sensitivity for the creatures that he chases and murders. While Rainsford and Whitney are both on the watercraft, Whitney expresses that he trusts that the Jaguars that they are going to chase have emotions. Rainsford expels the thought as Jabber, yet Whitney holds on that in any event the creatures must know fear.