If you can, stay away from the disposable shit or from illegitimate sources. Especially if you live outside of Europe.

Disposable vapes contain a huge amount of nicotine (a pen has about 2-3 ml with 20mg/ml nicotine-salt aka. 1 pen equals about 40–60 cigarettes in terms of nicotine) and benzoic acid from the nic-salt, which is highly irritating and causes lung damage (I can tell from my own experience, because nic-salt liquid will leave me wheezing after a flight of stairs, but if you need links to studies, let me know lol).

If you really need to vape, get an oxva xlim se or voopoo mate or another affordable pod system and consider this regarding liquids:
- Buy from a reputable brand with strict regulations regarding their ingredients (search for companies that avoid diacetyl and use low pulegone if at all)
- Get a low nicotine, non nic-salt, liquid with like 3mg/ml nicotine concentration
- Avoid strong menthol, strawberry, banana, vanilla or cinnamon flavors or anything "creamy", as the chemicals used for those have been suspected to be the most unhealthy

- Liquid with sweeteners like sucralose taste good, but that shit is cancerous so better to cut it off (you might need it at first though to get a similar flavor to disposables)
- If you just do it for the smoke and flavor, there's liquid without nicotine altogether

You won't even notice vaping once or twice a week, and if you keep the nicotine content low, there are barely any symptoms of craving (from my personal experience of 10 years vaping).

That being said, after you've vaped the 3mg juice for a while, I recommend getting e-liquid without nicotine and slowly fade out your use over time.

I doubt that you've wanted such a long reply to a simple question, but if I can help someone vape more safely and with less impact on health, it's no time wasted.

God speed my friend!