B. because entry points are vital to the spread of infection
Yes it does the chemicals in whatever you are smoking are more than likely altered from what it originally was, therefore the chemicals start to taint the blood vessels and damage them permanently.
Not having any knowledge of what the drug might do to your body
You're answer here should be A- A compromise
To cope with stress, you'll have both negative and positive coping strategies and skills to learn from. To get through stress you should try and keep a positive attitude.