Question

1. what do nicotine replacement therapy, bupropion, and chantix have in common?

they all contain small amounts of nicotine to ease cravings.
they all make you feel nauseated when you smoke after taking them.
they all require a doctors prescription.
they all work to ease the symptoms of nicotine withdrawal.

Explanation:

Nicotine replacement therapy provides a controlled dose of nicotine to reduce withdrawal symptoms. Bupropion (Zyban) works on neurotransmitters in the brain to ease nicotine withdrawal symptoms. Chantix (varenicline) acts on nicotine receptors to reduce the pleasure from smoking and ease withdrawal. They are all aimed at helping with nicotine withdrawal symptoms.
Nicotine replacement therapy contains nicotine, but bupropion and Chantix do not. Not all of them cause nausea when smoking after taking (it's more specific to some cases). Nicotine replacement therapy can have over - the - counter options (like nicotine gum in some cases), so not all require a prescription.

Answer:

They all work to ease the symptoms of nicotine withdrawal.