I quit cold turkey 29 years ago. It is super hard, especially during stressed times, but it can be done and you can do it!
My thought is, figure out (if you don't already know), what kind of psychological motivation works for you. Some people are naturally self-motivated. Some of us need external support -- a friend who cheers you on as you pass each day (or hour) without smoking? Setting up a reward for yourself as you reach milestones? (admittedly hard to do in these times, but -- a special food treat? A bubble bath? A session of silly-but-comforting tv or netflix?)
And if you fail, don't be discouraged, just start again. Most people need more than one try.
For me what motivated me was the reward of being able to say "it's been x days", so once I had a few days under my belt, it became somewhat self-motivating, to not "break the chain".
You could also set your last half-pack or whatever in a semi-hidden place and tell yourself you're saving it for "an emergency" (which will hopefully never come, of course).
Depending on your mindset, other ideas might help -- watching movies about people who overcome great hurdles. Watching documentaries about what smoking does to your lungs. (and seeing how much they will recover in as little as three weeks after you quit!)
And one of my favorite motivation techniques -- imagining yourself in the future describing how you quit, how hard it was, but how you persisted and succeeded!
Best of luck! This is hard but you can do it!
