Answer to Question 1
No smoking at home.
Eat at smoke-free restaurants.
Install fans.
Avoid rooms where people are smoking.
Ventilate areas where people do smoke.
Answer to Question 2
Yoga, overall, is generally considered safe. But there are some situations in which yoga can pose a risk. They include neck or low back pain, balance problems, uncontrolled high blood pressure, certain eye conditions, including glaucoma, severe osteoporosis, pregnancy, and artificial joints.
You may be able to practice yoga in these situations if you take certain precautions, such as avoiding certain poses or stretches. Check with your doctor or other health care provider before starting a new yoga program. Regardless of your health status, start slowly and gently. If you develop symptoms or concerns, see your doctor to make sure you're getting benefit and not harm from yoga.