Sometimes I take the weekends off. Also I get irritable if I don't get enough sleep AND not enough nicotine. It's a trade-off. As for tolerance, I haven't noti

Sometimes I take the weekends off. Also I get irritable if I don't get enough sleep AND not enough nicotine. It's a trade-off. As for tolerance, I haven't noticed the brain fog come back since I started, and I've been on this for 6 or 8 months so far.