Smoke to fit the barrels, is there a better way ?

[Tom]

Hi
I used the smoke method for fitting and they came out great no complaints. But I must admit it made a mess everything in the general vicinity is filthy.

Just for future reference is there a more modern method not using smoke ?

I'm not trying to cut corners or do sub standard work, my neighbor is telling me "that's the old method they don't do it like that anymore".
Any thoughts ?
Thank you, Tom