Lorazepam has a pretty short half life, and 1mg isn't a very high dose. If you were on an extended-release preparation of a benzo (Alprazolam ER) or a longer-acting benzo (Diazepam), then tolerance and tapering would be more of an issue. Hell, even Lorazepam can be damn addictive if you're taking it frequently enough, but in your case, I doubt it. I'd say you'd have to start taking 1mg at least twice a day for it to be an issue, and there are tons of people prescribed that / more per day for anxiety & panic disorders. Take care & be safe!