Hi and welcome to HCM.
There is no scientific correlation between smoking and legs swelling. This can be coincidence and you should find another cause of legs swelling. Usually people when quit smoking gaint weight because it slows their metabolism,but only temporary. AFter few months you wont have such problems anymore. WIsh you good health.

Hi brother,
I am happy to understand that you have quitted smoking. Earlier you quitted and restarted.
This time it should not happen. So I like you to understand certain facts regarding smoking and what is the reason for weight gain. Putting on a few pounds is healthy. Once you have successfully broken the addiction to tobacco, you can work on losing any weight you've gained.
Nicotine from tobacco boosts the body's metabolic rate, increasing the number of calories it burns. Immediately after you smoke a cigarette, your heart rate increases by 10 to 20 beats a minute. The unnatural stimulant effect of nicotine is one reason smoking causes heart disease.
When smokers quit, metabolic rate quickly returns to normal. That's a healthy change. But if you are getting the same number of calories as before, you will put on weight
By choosing low-calorie or zero-calorie foods, you can avoid putting on weight. Some smart alternatives include: Sugar-free gum, Sugar-free hard candies etc., to satisfy your "oral gratification." A step by step reduction of rich calorie diet is advised
Choose healthy foods that are rich in nutrients and low in calories.
The leg swell will automatically disappear
Don't miss this life time opportunity. Think that you are great by quitting. You will be great.
Best wishes