Do you have a shower or put clean clothes on after smoking pot

Do you have a shower or put clean clothes on after smoking pot ? I hear from people the smell gets every where and people can smell it.

Is this like that with all types of pot you smoke or the way you smoke it. Or it is only after one has many joints it is like this.So if a person does one joint or two joints you will not have to do this?

Even if you not smoking pot just being in the room with other people smoking pot you still have to have a shower or put clean clothes on .

Any spray one can put on one self to mask the order?? How long will the smell last ?