if you and i are in a closed confined area
and i smoke mad blunts . you will get a contact high.
meaning your counts can be any where from 5 to 20 nanos

most test cut off and 30 nanos
some 50 nanos

you should be fine . in an open place like an apartment
you wont obsorb.

but like in a care for hours with the window up.

you can.

ps. i used that theory in court and won
my counts was 17 nanos
i lied of course > LOL