Sometimes you have to let go of the ones you love, it doesn’t always work. Tell her you can’t do it anymore, it’s toxic and very bad for your mental health.
Because drug abuse is ba dbecasue its illegal to have drugs
Active listing is important so you can know what they are saying. Without active listening than you may forget things. Also the four rules of active listening are too look at the person (eye contact) listen too them. And I do not know the rest. Sorry, but that's the best I can do :)
An example of such jobs would be Mining and being a Pharmacist. Miners would often inhale dirt and other components that would destroy their lungs, while pharmacists would inhale fumes and other matter that's bad for you. The same can go for Construction workers who would inhale a large amount of dust.