I don’t think this is true. I used to smoke cigars once a month or so with a buddy of mine, and I never had the desire to smoke more than that. If you’re smoking like 3 or 4 times a week or something, yeah, you have a decent chance of getting addicted. But if it’s truly occasional, the risk of getting addicted is pretty low.
Getting high in college was to enhance a good feeling. Getting high now would be to remedy a bad one (the stress of work). As such, even though I got high fairly often, it was never out of an addictive impulse and there were plenty of stretches I just didn’t get high and it didn’t phase me. If I got high now, it would probably become quite addictive.