Round here it's pretty much accepted that the mask isn't to stop the virus/germs from getting to the wearer but the exact opposite. The mask is very effective at keeping the wearers germs and boogers to themselves. Im okay with that.
Right, and if you keep taking that mask off and touching your own spit with your fingers, what are you doing ?
Spreading possible infection around.
Might want to google Mary Mallon AKA "Typhoid Mary" for some interesting related reading.