Drug users or alcoholics often use in the same places/ with the same people/ around the same time a day so your body is conditioned to that and when you are in these familiar situations your body is basically preparing for you to use drugs.
When you switch up your normal routine your tolerance is actually lower because your body wasn’t triggered by your surroundings. This is important to consider to prevent people from overdosing by using a similar amount as normal in a situation where their tolerance wouldn’t be the same.
"People having seizures cannot swallow their tongue. Do not put anything in their mouth."
It's not that people actually swallow their tongue, it's that their tongue will rest in the back of their throats restricting their ability to breathe. People have heard this and misunderstood what was actually happening and spread misinformation for decades. So then things like this come out without actually addressing the truth or the root of the phrase. Your tongue isn't going to rip out of your mouth and go down your throat. It can rest in the back of your throat and choke you to death. That's what they are saying when they say "swallow your tongue."