Again, not everyone ends up addicted to Ketamine. However, I've seen people on it and it totally fucks them up. Even just temporarily. I would hate to think of a parent being on ketamine
Again, more nonsense.
Ketamine isn't physically addictive in the way heroin is, nor do people get hooked on it in the way they do coke / crack. People used to say it wasn't addictive at all, but having known lots of people who took it far too much, I'd disagree with saying it's totally not addictive. I'd say there are some people who find it compelling / very hard to leave alone. I've known a lot of people who took a lot of K, and I've never seen anyone desperate for it in the way addicts of heroin or crack are.
Having said that, for people who take it regularly, tolerance goes up very quickly; regular users find themselves taking more and more to get the same effect.
Ketamine is an anaesthetic. It's quite unusual for an anesthetic in that instead of sedating the user (slowing the heart and breathing down), it's a disassociate stimulant, meaning it works by separating mind from body, while increasing heart rate and breathing. This means it's useful as an anesthetic particularly for patients for whom you don't want to suppress heart rate / breathing - it's safer than most anaesthetics. Much harder to OD. It's often given as a pre-med, as it works so fast. Particularly to children and old people IIRC.
You absolutely wouldn't want anyone on K while looking after a baby - in the same way you wouldn't want anyone very drunk looking after a baby. Small amounts of K make people wobbly and unaware of their surroundings / where they're putting their bodies. Large amounts make people appear to pass out. (In fact they're in "k holes" - a dreamlike state, totally out of it but experiencing hallucinations inside they're heads and unaware of where they are or the outside world at all).
However, K is short acting. It wears off relatively quickly and doesn't leave users hungover. You bounce back much quicker that alcohol. From a safety point of view, someone who'd taken K the previous night is arguably a lot safer to look after a baby than someone who'd got blind drunk, as the drunk would be hung over or maybe even still pissed. The K user would be their normal self.
Someone who takes K every so often, out of the house, doesn't have a habit and doesn't do it anywhere near the baby is NO risk to the baby at all on account of K use.
I have never (that I know of) seen people on heroin, but I wonder if it's similar?
It's a little similar to heroin in that if you take lots, it knocks you out, but working on different body systems. Psychologically, it arguably does have similarities to heroin. Purely anecdotal, but it seems to me that the people who develop a problem with it K, find a similar appeal to heroin, in that it takes you completely away from your problems - hence more likely to appeal to people with problems they want to escape from, and more likely to develop problematic use.
K can be damaging to the body if you take loads, it recrystalises in your bladder, for example. Those who don't take much of it probably won't have an issue with it. But very high-dose, regular users will may find they're peeing blood as it's damaged their bladder. Also, like any stimulant, too much is not ideal for anyone with heart issues.
I haven't researched it for years (don't do it any more) so there may be other risks I don't know. When I used to take it, it was legal to possess in small amounts.
I went off it over 20 years ago as I got bored of it, and very bored of those around me not being at all communicative. When I still took loads of drugs, I liked taking a little bit as part of a cocktail of drugs as it heightened the effect of some other drugs (e.g. MDMA and LSD).
It's absolutely possible to be an occasional, recreational user of K without it impacting the rest of your life.
The issue with the OP, again, is her BF laughing instead of talking to her on a level.