In Sweden Psilocybe semilanceata grows freely in Autumn. Good spots to find them is in meadows and golf courses. https://en.wikipedia.org/wiki/Psilocybe_semilanceata

In my opinion though smoking isn't black and white. It's the modern way of smoking that is the biggest detriment. Here's a list of cigarette smoke carcinogens. https://en.wikipedia.org/wiki/List_of_cigarette_smoke_carcinogens

I make my own cigarettes on Nicotiana/organic whole tobacco leaves, Lavender, Linden tree flowers/leaves, Mentha/Mint, St John's wort, Ginko Biloba etc. It is a much better alternative to smoking the commercial cigarettes and I find it has a lot of positive effects aswell.