I have wondered about this. If I notice a temptation to increase the use of any substance (whether alcohol or weed), I tend to worry that it's the start of a slippery slope into addiction. But then I wonder if I'm being too harsh on myself. Is it bad that I look forward to my weekend weed? Is it bad to have weed twice a week instead of once a week? Is it bad to drink twice a week when I used to drink once a week? So then I start to put arbitrary limits on my own partaking, so that I know for sure that I'm not becoming addicted. And then my "choice justification" mind goes "well those limits were arbitrary anyway" as a reason to break my self-imposed "rules". It's tricky.