Which is not caused by the combined effects of nicotine, tar, and carbon monoxide on the cardiovascular system?

A smoker's neurotransmitters are replaced with new chemicals.

Explanation:

Neurotransmitters are including glycine, glutamate, monoamines, norepinephrine and more.

When a smoker is using nicotine, the nicotine is binding to nicotinic receptors that can be found in the brain and then they can enhance the release of the neurotransmitters such as serotonin or dopamine and that is why it is causing addiction. Nicotine is also able to release neurotransmitters.

yes you do or he will not stop with that

they cheat and apolgize adn they do it again

explanation:

daily refers to frequency, like weekly or monthly. take this medicine twice daily, once in the morning and again at bedtime. on a daily basis there refers to everyday life, to one's normal or usual behavior, activity, routine, or schedule, to the quotidien.