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🩺 General and Preventive Health

The dangerous link between smoking and diabetes

MBBS
Medically Reviewed by MBBS ✓ Medically Reviewed
📅 Updated: Jul 14, 2026 • ⏱ 6 min read • Editorial policy
The dangerous link between smoking and diabetes
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If you smoke, you are at a much higher risk of developing Type 2 Diabetes. In fact, your risk is 30% to 40% higher than that of a non-smoker. If you already have diabetes, smoking can make it harder to control your blood sugar levels. It can also make other health problems caused by diabetes worse. The best thing you can do for your health is to quit smoking. But we know that doing it alone is not easy. That's why it's important to get support from friends and family. And, be sure to talk to your doctor about this. He or she has treatments that can help you quit smoking.

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How does smoking cause diabetes?

The main chemical in cigarettes is nicotine. Research has shown that nicotine can raise your blood sugar levels. Simply put, smoking harms your body in many ways related to diabetes. Let's see how.

Effect What Happens
Insulin Resistance Nicotine makes it difficult for the body's cells to respond to insulin, a hormone that helps the body use sugar in the blood for energy. This resistance causes blood sugar levels to rise.
Inflammation The chemicals in cigarettes damage your cells. As your body tries to repair this damage, inflammation occurs. This damage makes it harder for your body to use insulin properly.
Increased belly fat (Belly Fat)If you are a heavy smoker, you may be more likely to accumulate fat in your belly area. Even if you are thin, this accumulation of belly fat contributes to insulin resistance and diabetes.
Other health problems Smoking raises "bad" cholesterol (LDL) levels and lowers "good" cholesterol (HDL). It also increases triglycerides, a type of fat in the blood. All of these are directly linked to diabetes.

The effects of smoking if you already have diabetes

If you have diabetes, nicotine can make it harder to control your blood sugar levels. If you use insulin, you may need more insulin than someone who doesn't smoke.

The most important thing is that when smoking is combined with uncontrolled diabetes, the damage to the entire body accelerates very quickly, because it damages all of your large and small blood vessels.

Compared to someone with diabetes who does not smoke, you who smoke are at a much higher risk of developing these risk conditions:

  • Heart disease
  • Eye problems
  • Stroke
  • Kidney failure
  • Nerve damage / Neuropathy
  • Erectile dysfunction

The relationship between smoking and sleep

Research has shown that smokers do not get good, quality sleep. This lack of deep sleep, which is the body's way of resting, has also been linked to diabetes. One problem here is that nicotine is a stimulant. This means it can keep you awake. Not only that, but when your body goes through withdrawal at night, it can also disrupt your sleep.

On the other hand, you may still have trouble sleeping when you first quit smoking. If that's the case for you, talk to your doctor about it. He or she can give you tips on how to get a good night's sleep.

Benefits of quitting smoking

Your blood sugar levels may rise slightly when you first quit smoking. This may be because you gain a little weight after quitting. But experts aren't sure if the weight gain is the cause. However, don't give up, keep going.The longer you stay away from cigarettes, the better your insulin resistance will be.

Imagine, if you don't already have diabetes, you have a small chance of developing diabetes in the early days of quitting smoking. The risk is highest within the first two years after quitting. But if you've been completely smoke-free for about 10-12 years , your risk is the same as someone who has never smoked. How good is that?

Need help quitting smoking?

If you find it difficult to quit smoking, don't suffer alone. Talk to your doctor about this. He or she can suggest a combination of treatments that are right for you. For example:

  • Counseling: Helps to build the mental strength to overcome the causes of smoking addiction and overcome it.
  • Nicotine Replacement Therapy: Provides the body with small amounts of nicotine through patches and chewing gum, reducing the craving for cigarettes.
  • Antidepressants: Some medications, such as Bupropion, can help make it easier to quit smoking.
  • Other medications: Medications such as Chantix'' that block nicotine receptors can reduce the pleasure of smoking and help you quit.

Remember, your doctor will decide which of these treatments is best for you, so be sure to seek their advice.

💡 Take-Home Message

  • Smoking increases the risk of developing Type 2 Diabetes.
  • If you already have diabetes, smoking makes it harder to control the disease and increases the risk of complications.
  • Quitting smoking is the best investment you can make in your health. Over time, your risk of diabetes will be reduced to the same level as someone who doesn't smoke.
  • If quitting smoking is a challenge, don't try to do it alone. The best person to help you is your doctor. Talk to him or her about this today.
❓ FAQ

FAQ

Evidence-based clinical answers to common patient questions

Need help quitting smoking?

If you find it difficult to quit smoking, don't suffer alone. Talk to your doctor about this. He or she can suggest a combination of treatments that are right for you. For example:

  • Counseling: Helps to build the mental strength to overcome the causes of smoking addiction and overcome it.
  • Nicotine Replacement Therapy: Provides the body with small amounts of nicotine through patches and chewing gum, reducing the craving for cigarettes.
  • Antidepressants: Some medications, such as Bupropion, can help make it easier to quit smoking.
  • Other medications: Medications such as Chantix'' that block nicotine receptors can reduce the pleasure of smoking and help you quit.
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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.