Holy Moly
That's expensive. Flying is these days though not let up in AvGas prices means it's going to continue to be.
Although I saw a packet of cigarettes is £8 now days. I used to smoke, when I smoked, a packet a day plus a few more at the weekend, around 8 packets a week. That's about £64 a week. Over a month that's around £256. So smoking is still working out more expensive then going flying for an hour and a bit each month.
Save money. Stop smoking, start flying.