What is a common side effect of nicotine replacement therapies?

Nicotine replacement therapies (NRTs) such as patches, gum, lozenges, inhalers, and nasal sprays are commonly used to help individuals quit smoking by providing them with a low dose of nicotine without the harmful substances found in tobacco. One of the frequently reported side effects of these therapies is nausea.

Nausea occurs because the body is adjusting to the introduction of nicotine, especially if the dosage is higher than what an individual is used to from smoking. When used properly, NRTs can mitigate withdrawal symptoms, but an overdose can lead to gastrointestinal disturbances, including nausea. This side effect is particularly prevalent in people who may not have smoked regularly or who are new to using nicotine.

While it is true that weight gain can occur after quitting smoking due to metabolic changes and increased appetite, it is not directly a side effect of NRTs themselves. Insomnia may arise in some users, often related to the adjustment period or withdrawal symptoms rather than a direct consequence of the therapy. Headaches can also be experienced but are less commonly associated with NRTs compared to nausea, which is a more pronounced reaction to the nicotine provided by these therapies.