Is casual smoking a sin?

Before I get a ton of down votes, hear me out.

I used to smoke 5 cigarettes a day, not even real cigarettes as others say, I smoked neo, a heat not burn cigarette which is proven to be 70% more healthier than a normal one. And every time I smoked one I was in nature and made me thankful to god for everything, my mind seemed more clear (one of the effects of nicotine), also you might say that I should take snus as a much healthier alternative but they are way more addictive. Last time I smoked was about 3 weeks ago and life seems more somewhat boring, everytime I go into a forest and admire god's work I feel like I am missing something. Open to any advice you can give!