It sounds like you're looking for something to help you kind of *chill out* after work (ice joke) without falling asleep completely. I know people who have been able to do this but it's extremely rare to come across them. Typically it starts out as an innocent enough habbit for those who can handle it, and then you're scrambling to catch up after a big hooker binge on the weekend, all fucked up on Monday and everybody can tell you're twacked.
However, if you are one of the very select few people on Earth who can just take a puff and put it down, my hat is off to you sir. I wouldn't say you would incur any more long-term damage from that then possibly daily Adderall use. Except for you do you have to remember that the lung damage is real. That route of Administration has sort of gone the way of the dinosaur for me unless I'm smoking base triptamines, I used to be intravenous as well because it gets such a rush, but the risk of infection and the long-term damage and general is just not worth it *to me*
However, if you are, again, one of those very rare few who can just take a toot and put it down. I honestly don't see a huge problem with that. I think you would incur more damage from a daily alcohol habit than you would off of a three times a week one puff after work situation. But that's a slippery slope as All Slopes which are coated in crystals get. Very slippery.
Honestly I've been down that road, and I would highly recommend you try it phenylpiracetam, it's not as recreational but you can definitely use it at work and you do get a good buzz off of it if you down it with a coffee and some heavy cream, it is soluble in water but it is better absorbed when ingested with fats, and if you are into just taking tiny doses of stuff you might want to just look into microdosing LSD, it's got a lot of useful applications. To be honest it has changed my life, I don't touch ice anymore, I don't touch blow anymore, there's a lot of things I don't do anymore because I'd rather just take a quarter hit of acid and go about my day. It lasts all day, you get a nice reasonable buzz off of it, and you're extremely productive if you know how to navigate to headspace. You won't have any desire to use anything else after work because you're done being creative and productive for the day. It's just a much better choice, so, with that in mind, have fun doing what you will, and I hope all the best for you! Party safe buddy :D