No.
A microgram is a measure of mass. A cubic centimetre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a cubic centimetre of air. How many micrograms? Next consider a cubic centimetre of lead. How many micrograms?
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No, 1000 micrograms (mcg) equals 1 milligram (mg), and 1000 mg equals 1 gram (g), so a gram is 1,000,000 mcg.
1000 mcg = 1 mg so 18 mcg = 0.018 mg. Simple!
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No, 50 mcg does not equal 5 mg. The prefix "mcg" stands for micrograms, while "mg" stands for milligrams. There are 1,000 micrograms in a milligram, so 50 mcg is equal to 0.05 mg.
1000 mcg = 1 mg so 300 mcg = 300/1000 = 0.3 mg. Simple!