Leave the room and come back in due course

Yes if the mother agree..I know becouse my son has my surname.

Oral communication is the one you do by voice another one is by written exp: Thelephone  is verbal. By e-mail written.

I think the people smoke pot usually smoke less than the people that smoke cigarettes becouse Marijuana is stronger.

Yes you can by the body language and the way they Beauvoir.. Usually the way someone is looking at you  not directly in the eyes or even excessive swatting.