Depends.

Someone smoking 3g in a month isn't like someone like me smoking 1g a day.

and 1g a day is fuck all

Ignoring medical aspects, there are mostly craving/psychological effects - you simply want to smoke, its nice, its associated with nice feelings and your brain loves reward.

OK its not crack but I think people still need to have some respect for MJ nonetheless.

Also crappy schwag vs some TehUberDankkk smoke is something else.

But I haven't been without weed for over 3 years straight so wtf would I know