Why smoking related issues are not clear,studies are confusing?

~why nearly 15 out of 100 long term smokers develop lung cancer and not remaining 85
~Why not all long term smokers develop infection related to smoking(i think its 50% or 30% who develop)


~what amount of smoking "pack years" is needed to cause any smoking related illness??
Answers:
Are you trying to convince yourself that it's okay to hold on to on smoking?
I don't know which TOBACCO COMPANY SPONSORED SITE you get your information from.. but SMOKING.. will EFFECT EVERYONE WHO DOES IT OR IS AROUND IT... some people are just more susceptible to cancer than others.. but that doesn't scrounging EVERYONE WHO SMOKES is not at risk.. BECAUSE THEY ARE.

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