False because mainstream smoke is defined as smoke from a cigarette or pipe. Second hand smoke is smoke that has been inhaled by someone then exhaled, making you the "second" one to breath it :)
First, because you need to be careful of what you are eating and should not eat.
Second, if you don't care about what you eating it could be really dangerous.
To monitor changes to the problem. They need to be able to see the changes.
Answer:
you can research about the internet (social media,tv,etc) families (their behaviours, toxicity, etc) and school (work load)
Explanation:
