you can ask them if you can smell their mouth and if it smells like smoke it means they are smoking.
u cant!
tell someone aysap
they will tell u and identify it throw a scan
Secret spy cameras.
The tests were in no way scientific
Its not always easy stopping someone from smoking. Its a really hard habit to quit. First step is to tell the person that u care about them and telll them that they need help or rehab.
It is possible to tell if someone is sexually active from a blood test. This will be done in addition to other clinical tests so as to be certain.
Worse than secondhand from tobacco. First off, you fail drug tests, second off, it might start rotting your teeth out. Just tell the person that's smoking around you to stop smoking around you, or better yet, tell them to get help.
I would tell them to either leave, or sternly tell them to smoke outside or in a section of the house or property that does not stink up your home. i would also think it would help to have a punishment for smoking in the house, and if they continue to smoke in your house.
I can not tell you if someone will go into your home and hide. If you are scared think about getting a camera.
Yes, if you ate food and ran. No if you have not. But tell someone near you and see if they can help.
If the person says unnecessary things to you, tell them to stop disturbing you. If that does not work, tell an adult at home to handle.