Answer:
Although nicotine is a very addictive substance it's relatively harmless. It's the carbon monoxide, tar and other toxic chemicals in tobacco smoke that will cause serious damage to your health.
Explanation:
A) circulatory it helps the oxygen move around in your body.
Answer:
Option 4
Explanation:
The 4 most common lengths for races are a 5k (about 3 miles) a 10k (About 6 miles) a half-marathon (13.1 miles) and a marathon (26.2 miles).
Physical dependence is marked by a state of mental and physical abnormality when the drug is withdrawn.
