My gums are very sensitive lately. they are a little swollen in the front. i didn't brush or floss that often and i smoke. maybe gum disaese?

Absolutely: Seems like you have correctly self diagnosed. Stop smoking, floss, antibacterial mouthwash like listerine and start seeing your dentist. Dont forget, smoking is a risk factor for oral cancers, a terrible disease.

Periodontal disease: It sounds like that you have periodontal disease. It could be plain gingivitis (early stage) or periodontitis (advanced stage). I suggest you see your dentist to decide if you need deep cleaning (scaling or root planing.

Gingivitis: Start with better oral hygiene, or say hi the prmature tooth loss. Also say hi to your dentist.