Smoking a few cigarettes every once in a while represents a significant danger to one's health?
Smoking a cigarette may not make one sick for years,...
My point.
...but it is never a helathy habit,...
Habit means regular use.
...and in the end taxes the system.
Depends how much. Occassional cigarette use represents an insignificant health risk.
Not evil?
Not intrinsically.
One could make the argument that since the body is the temple of the Holy Spirit, that putting a substance known to be not only toxic but carcinogenic is also immoral.
Yes, if used in dangerous volumes. The situation is analogous to alcohol use, which Jesus OK'd (see the wedding feast of Cana).
I think one make the same argument about the occassional "rogering" too - so as long as a homosexual only has anal sex, let say, once a month, is it now ok, according to this standard?