It harms your lungs and puts you at a higher risk for asthma and other respiratory problems, It damages the immune system, and the toxic chemicals released into the air settle into plants and water sources then animals eat the contaminated plants and drink the water, therefore the poison travels down the food chain to us.
Lean meats are included in a healthy diet.
A wouldn't help, it just bottles up their feelings, even more, hurting them in the end worse. Medication can't always be the answer, and you can help with everyday errands, and refer them to a hospice depending on how much this grief is deteriorating their mental health. Based off of where they are mentally, all of these would be a good idea, except A. Help them talk about their stresses but only if they are comfortable with it.
I don't know if this is for homework, or for personal reasons. This answer only really helps with personal reasons.