Our expert says:
Interesting question, A. And of course with any illicit / non-legal substance, there's less of the sort of research we'd like to see to answer such questions firmly., for obvious reasons.
Marijuana may feel nice at times, but isn't good for brains. There's some relation to the development of psychotic illnesses in some apparently vulnerable people, but this is still a bit controversial. There may also be a relationship with a syndrome or pattern of general passivity and under-activity, etc.
And of course, marijuana as smoked is even dirtier than tobacco, and at least as bad for your lungs.
But of course we vary greatly in our sensitivity to the psych effects, and many people show little in the way of problems, while some people seem really unpleasantly affeted.
Some of these problems may be lasting / continuing, but if one has stopped smoking it, and there are no obvious problems at that time, then apart from the possibility of lung and related problems ( exactly as with tobacco smoking ) its unlikely that new psych problems will develop or worsen after one stops
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