In Canada, radon is the leading cause of lung cancer in people who have never smoked, and the second leading cause among people who currently or previously smoked 1
It could simply be indigestion
Examples of tobacco industry interference include direct lobbying, political contributions, creation and/or funding of front groups to advocate on their behalf, frivolous lawsuits intended to impose legal costs, misleading mass media campaigns, and ensuring seats at the table of government advisory bodies, including with the Food and Drug Administration
Misuse can include taking more than your prescribed dose or taking it more often, using it to get high, or taking someone else's medicines
Another deduction: After calculating your self-employment tax, you can then make an adjustment to income on Form 1040 (Schedule 1) for half of the self employment tax amount, which will further reduce your taxable income and your tax bill