When someone smokes marijuana does the smoke stay in their saliva and mouth, if i kiss him immidietly after will i get marj. in my system?

Probably not: Kissing after smoking m not likely for you to get it in your system. May taste and smell bad like after cig use. However, you are likely to get the m in your system from being exposed to the smoke in room. Second-hand smoke.

No anymore: likely than nicotine. It will be absorbed into the smoker's saliva and blood stream but not very easily transmitted to someone else.