The most important types of exercises that build cardiorespiratory endurance are aerobic exercises, because those get the blood flowing and and the heart pump better.
#1 would be A, #2 would be false, as narcotics are incredibly addictive. #3 is absolutely true, as abuse of almost any medical thing can be life threatening.
Depressants. aka things such as alcohol, heroine, & many other drugs<span>.</span>
