Periodontology
...Smoking and chewing tobaccoPoor diet, especially one high in sugarPoorly fitting dentures or bridges, misaligned teeth, defective fillingsGrinding or clenching the teethPregnancy or use of oral contraceptivesMedications: steroids, cancer therapy drugs, some calcium channel blockers, some anti-epilepsyDrugs (consult your dentist/periodontist)Systemic diseases such as HIV or diabetesCan Periodontal Disease Be Prevented...

Research on Periodontal Disease and Overall Health
... Other known risk factors include tobacco use, genetics, drug and alcohol use, level of prenatal care, nutrition and urinary tract infections...

Periodontal Disease
... There are many factors that contribute to periodontal disease, such as oral hygiene habits (grinding or clenching), poorly fitting dentures or bridges, stress, general health, medications, systemic diseases, genetics, poor diet, and tobacco use, which can also influence treatment effectiveness and disease recurrence...

Bad Breath (halitosis)
...Tobacco products cause bad breath, stain teeth, reduce your ability to taste foods and irritate your gum tissues...