The answer depends on what is meant by good and what is meant by bad. Mastubation is not a health risk and the majority of people have done it at some point or continue to do it. Some cultures and some religions feel that it is wrong for a person to sexually pleasure themselves but this is purely a non-medical response.
a form of mastubation
That is really gross, but however long you want.
Yes, tar is very bad for your health
The correct spelling is masturbation, and the answer is no, it is not bad for your health.
Is Shepard Smith in bad health
They are not bad for your health, don't believe that b.s. (bad sources)
Yes its very very very bad for health
bad, bad, BAD
They are not bad in themselves. What make them bad for your health are the bacteria that they carry with them. Some of them can make you very sick.
yes any type of drug is bad for your health
Generally no. They are, for the most part, enzymes, and they aren't "bad" for health.