Subject
- Cigarette smokers -- Counseling1
- Cigarette smokers -- Health and hygiene -- Saudi Arabia -- Riyadh Region1
- Cigarette smokers -- Physiology1
- Men -- Health and hygiene -- Saudi Arabia -- Riyadh Region1
- Pipe smokers -- Health and hygiene -- Saudi Arabia -- Riyadh Region1
- Saudi Arabians -- Health and hygiene -- Saudi Arabia -- Riyadh Region1
- Smoking -- Psychological aspects1
- Vitamin B6 -- Metabolism1
- Vitamin B6 -- Physiological effect1
- Vitamin B6 in human nutrition -- Saudi Arabia -- Riyadh Region1