The leaves should be slightly furry/fuzzy and a bit lighter green than that (unless the photo has distorted the colour?) - at least they are on the varieties I grow (alata and sylvestris). Also, if you touch them they should be a bit soft and floppy, not robust.
I compost nicotiana, cosmos and Verbena bonariensis at the end of the season. When my friend had a new house, she had the contents of one of my compost heaps. She had an entire border full of seedlings of the above three. Thinned out a bit, they made a lovely border all on their own. That compost heap obviously didn't get hot enough.
I I planted nicotine my first year living here, six years on it’s still popping up every year…. I swear last year it was all white but this years crop is a lovely selection of pinks and purples…. Seeds get everywhere.
Marne la vallée, basically just outside Paris 🇫🇷, but definitely Scottish at heart.
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In the sticks near Peterborough