The thing about smoking opium is, it's wasteful. If you eat it, the high is much stronger, and it lasts longer and is fully because you ate it, As such, I would imagine tolerance and dependence faster by eating it, since it would be affecting you for a greater time. But it also depends on frequency of use when smoking it. If you're toking it every 30 minutes, the same amount as you could have eaten at once might produce more dependence.
Either way opium is super addictive so be careful.