All people are different. Perhaps they are showing signs of mental addiction...perhaps they just REALLY like getting high.

Stuff like this is not uncommon. There are people who CAN'T seem to do anything untill they have a cup of coffee too.

It's not really the most healthy thing...to spend alot of your time and/or money on something. But people do it all the time.

Let them know you care and you don't want to see cannabis affect their life in a negative way (if it truely is). Cannabis like most things, can be both a positive or negative impact on a persons life. Sadly, the illegal nature of using cannabis makes the prices of the substance very expensive. This is something that can't be helped unless you find a good connection or choose to grow yourself. That alone can certainly have a negative impact on financial stability. To me however, that's just another reason why criminlization of cannabis harms more people than if it were legal.

Anyways....just let them know you care and are concerned....that's really all you can do.

Best of luck and take care!