a couple months to a year is a VERY long time to reset tolerance, and if it really took that long, weed would be among the highest tolerance forming substances in common use. Luckily, it does not take nearly that long. Most people increase their dose to get to the same high after many days of repeated use. After a week or so of daily smoking at the most, this effect will be very noticeable to virtually everyone. This tolerance also reset quickly - a few days should do it. In addition, pretty much everyone ends up "getting used" to being high after having smoked many times, even after taking a break from smoking. I think that this is due to one's mind becoming accustomed to the psychoactive/psychedelic effects of THC; the overwhelming nature of the first few highs is replaced by a more controlled, yet (in my personal opinion) also more rewarding experience. This is based on what I have read and experienced and what people I know have told me, and psychoactive substances affect different people differently, so YMMV.