It's B. Stimulants speed up the central nervous system.
False because mainstream smoke is defined as smoke from a cigarette or pipe. Second hand smoke is smoke that has been inhaled by someone then exhaled, making you the "second" one to breath it :)
The coordinates (4,7) (6,10) and (8,13) all follow this rule
Although it is said that marijuana is not good for the body, it is still harmful to the lungs and by smoking it you could potentially put yourself or others in danger. Marijuana dulls the senses almost like alcohol.
cardiotonic is a drug or substance having a tonic effect on heart.
