I don't feel immune to cancer. Though there is evidence that if you stop smoking young, the risks of cancer reduce by a lot. People often smoke because they enjoy it and it relaxes them (even though more evidence says that physiologically it doesn't reduce stress). It, for me, is also a way of getting a 'break' away from social situations. I also have never found it easy to give up. I can get past the first few days quite easily, but usually restart after 3-6 weeks, often when there's been a stressful event in my life. Of course, I'm not disputing that not smoking is healthier than smoking!
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