________: Two drugs have different actions, but when they are taken together, one enhances the effects of the other (1 + 1 = 4).

The Harrison Act required any person in the business of dealing in drugs covered by the act was required to register annually and pay a special annual tax of ______.

The feeling of general well-being produced by heroin is referred to as the __________.

Genetics seem to play a role in the predisposition to nicotine dependence.

Medical use of hallucinogens has been largely replaced by benzodiazepines.

The __________ Act strengthened the amendment that enacted Prohibition.

The Alcoholics Anonymous (AA) approach of using public confession and commitment and mutual aid concepts can be found in a number of _____ century temperance organizations.

With the passage of the _______________ “drug testing also became a standard feature in the workplace as a way to measure worker productivity and to ensure public safety”

Excessive labor costs and a low-potency gum yield caused opium’s failure as a viable agricultural crop in ____________.

The earthworm has a _____ plan.