Unprotected sex is obviously linked to HIV, HBV, HCV, Syphillis and other viruses and bacteria.At most only between 10-15% of smokers actually get cancer (and this is just one reference out of many <a href="http://www.netwellness.org/healthtopics/help/risk.cfm).">http://www.netwellness.org/healthtopics/help/risk.cfm).</a> of course not everyone that gets cancer from smoking actually dies, so it is a little fuzzy as too exactly how much of a risk smoking actually is a