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No, as long as you stay calm then you don't have to hold your breath.
It can stay your system for up to 30 days after your last smoke.
5 minutes
it will stay in there for about 2 years
no, but they can stay underwater for a long time
About 2 months
Depends on the size of the particles.
30 minutes.
Generally until you wash them.
it stays in your system for a month no matter how much you smoke.
Not very long. Neptune is made of Hydrogen and helium. So you can't breath.
The alcohol contained in exhaled breath would be gone within an hour and one-half.