How to express all this love and loss at a funeral

You have said it so well already Kiora, and everyone will understand your sorrow

Everyone else has said the same while I was composing my reply on this flipping tablet. :-)

Kiora Do not do a poem unless you are brilliant at it, they can sound trite.

Say exactly what you have just told us! Perhaps finding another way of toning down the drinking and smoking. People who knew him and loved him will understand.
You put it very well in your post.

The hardest thing I ever had to do was write and read the eulogy at my grandson's funeral. You should just sit down and write from the heart.
Yes, you will cry but that's part of the process.

Others simply read a poem. There are some lovely ones out there. Perhaps you can find something suitable instead?

I think you've got most of it in your OP.

You could start with ...Well what can I say about Uncle ....

^He drank..a lot he smoked ...a lot, he swore...a lot. He never ate a healthy thing in his life, he paid a heavy price for for all the above. I asked a few months before he died if he would change anything ( he was suffering very badly by this stage and on oxygen 24/7 he couldn't walk more than a dozen steps.) He told me no life's for living and I lived it up. he was faithful to his wife for over 50 years . He was a loving and generous father and an indulgent grandfather. He adored his extended family He was generous...to a fault, he could be called on day or night to get you out of a jam. If he loved you, you knew without a doubt that you were loved. He really believed that we his family were the most amazing people, he thought we were beautiful
( most of us aren't) clever(even less of aren't) his pride in us could be embarrassing.^

Finish by talking to your uncle.....Uncle ...you were an amazing person and we're all going to miss you.

I think you said it there kiora. That was really moving and obviously from the heart!

I'm sorry fir the loss of your uncle - I wish I had one like him.