Select the incorrect statement.
a. Heroin was originally marketed as a cough suppressant.
b. Heroin was originally developed in order to replace morphine with a less-addictive narcotic.
c. Heroin is currently classified as a Schedule II drug in this country.
d. When injected, heroin tends to be more addicting than most other narcotics because of a rapid intense feeling of euphoria

The drugs that are considered the most dangerous by the DEA are known as Schedule I substances. These are drugs with no current medical use, per analysis by the DEA and FDA. These substances also carry a high potential for abuse and addiction. Heroin, LSD, Marijuana Ecstacy, Quaaludes, Bath salts. Therefore making answer C incorrect

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.