What's the difference between life expectancy of cigarette smoker and general population?
The difference in life expectancy between smokers and non-smokers appears to be at least 10 years on average, in a survey of American adults between 1997 and 2004.  

The same paper lists causes of death (higher among smokers than non-smokers, as measured by hazard ratio), although this is not exhaustive: lung cancer, other cancers, ischemic heart disease, stroke, other vascular disease, and respiratory disease have an adjusted hazard ratio of 1.7 or more, with 94% of lung cancer deaths attributable to smoking among female smokers, and 93% to smoking among male smokers.

If you have access, you will probably find Table 2 (hazard ratios) of interest.

Figure 2 shows the survival probability: