I'd say you should take what people tell you at face value unless they're a close friend. There was a commenter here who said they had to stop reading book because it was addictive to them. Anything can mess up someone's day. Weed makes some people not feel okay. It makes some people want to smoke it (or eat gummies or whatever) way too often. Plenty of other people have totally fine relationships with it.

Unless you really have a view into someone's life I wouldn't worry about trying to decide if they're lying and if something like an intervention is necessary.