Weegy: Marijuana increases heart rate by 20-100 percent shortly after smoking; this effect can last up to 3 hours. http://www.drugabuse.gov/publications/drugfacts/marijuana (More)

Weegy: Typically, a heroin abuser may inject up to 4 times a day. D. 4 times. User: An estimated ________ (12 percent) aged 12 or older reported driving under the influence of alcohol at least once in the past year. A. 1.2 million people B. 60.2 million people C. 30.2 million people D. 15.2 million people Weegy: C. 30.2 million people (More)

Weegy: answer is A (More)

Weegy: A typical smoker will take 10 puffs on a cigarette over a period of 5 minutes that the cigarette is lit. (More)