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Carcinogens and other maloffect are overrepresented. The anti-cancer properties of cannabis are strong enough that the carcinogens in the smoke are negligible.
A study recently showed that people who smoke cannabis alone are less likely to get lung cancer than those that do not smoke anything at all. Study source
The issue is that blood THC levels do not corelate to impairment in the way that Alcohol does. Small amounts of cannabis can improve some people’s driving ability.
See a study of ADD and Driving.