[mtlmtlmtlmtl]

Not the GP, but for me it can be both. Depends a lot on your overall usage pattern.

Right now I only really smoke once a month at most, when the opportunity presents itself. In these cases, I'm obviously completely non-functional under the influence. But I also smoke a lot less because I have no tolerance, I feel pretty much completely fine the next day, possibly even better than usual, because the resulting night of REM suppressed sleep gives me a jolt of antidepressant effect without the downsides of sleep deprivation.

If I'm in a binging mode, it means I have a huge tolerance, smoke a ton more, and honestly it takes at 2-3 weeks of abstinence before I'm back to baseline for working memory, possibly longer.

But paradoxically, if I'm in such a binge, I'm probably more functional if I've had my morning smoke compared to skipping it for the day, because abstaining would then cause me to be highly irritable and unable to focus on anything in addition to the state of temporary dementia I'd be in. And since there's a massive tolerance, one dose won't have acute deleterious effects to the same degree.