Answer: It is a running gag throughout the show that Kramer likes to smoke cigars, but one memorable scene was from The Wallet (part 1) when Kramer runs out of matches, so he lights the cigar using the stovetop and his hair catches on fire.
Answer: With a kidney transplant, you want all the vascular tissue to the new kidney as possible, to give it plenty of blood flow. When you smoke, it causes your blood vessels to narrow, which reduces blood flow to your transplanted kidney. Not smoking would increase the chances that the transplanted kidney will thrive and function as well as possible.
It would not be advisable to use any tobacco product for this reason alone, despite all the other risks that tobacco can cause to your health.
Answer: Repeated tobacco use will eventually cause heath problems whether it is cancer or otherwise. An occasional cigar is not going to kill you however. It takes years of constant use to cause cancer.
Answer: Cigars lose quality when not in a controlled environment Cigars in the box and in wrappers still breathe. 65 -70 % humidity, 70 degrees is what you want. If you let them dry out they are no longer cigars... just leaves. A properly aged cigar can last up to around 50 years before losing its flavors.