Cigarettes do not contain propane. Propane is a flammable gas. Most cigarette lighters contain butane (though some refillable lighters use a naptha or petroleum-based lighter fluid), and that is used to light the cigarettes, but you are not constantly breathing that.
petroleum refining is petroleum refining
Something that contains no petroleum is petroleum-free.
Yes, If you smoked 5 cigarettes chances are high that you will get addicted to the cigarettes.
Petroleum is a liquid.
The smoothness of cigarettes varies a great deal as far as taste goes, and e-cigarettes are not all the same, but generally e-cigarettes that I have smoked seem to be smoother than cigarettes.
No. tobacco is in cigarettes.
cigarettes
A. E. Dunstan has written: 'The science of petroleum' -- subject(s): Petroleum engineering, Petroleum industry and trade 'Chemistry and the petroleum industry' -- subject(s): Petroleum
petroleum is a science fact
a bit
No, it is not. Petroleum is a form of resource.