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I wouldn't be so sure of that, Native Americans and plenty of other indigenous people smoked copious amounts of things and didn't have incidents of cancer. Cancer is likely more a cumulative effect of modern living as a whole. Carcinogenic substances/things + compromised immune systems for various reasons + other factors = cancer.
You kinda shot your own point off into the grey. If the variables are blurred into a myriad of lifestyle choices and conditions... then smoking without the combination may not have been enough to cause cancer in centuries past... but this still doesn't prove that smoking doesn't contribute to cancer... especially while science has proven that as of recently... hence the olive oil example.