I would go with all of the above
"Bad" bacteria because there are also good bacteria that we need in order to live not just healthy, because every person gets sick and we need it for our body. Too much good thing is a bad thing.
Hallucinogen is the answer to your question
<span>The europhoric state caused by asphyxiation is due to a dangerous lack of oxygen to the brain.
Asphyxiation. </span>